Fudgy 3-ingredient banana brownies made with ripe bananas, cocoa, and eggs. Quick, kid-friendly, and...
Brookies Cookies — Browned Butter Blondie with Fudgy Brownie Swirl
Alaina
11 February 2026
50 total time
12 servings
3.8 (9)
Introduction: Why Brookies Deserve a Spot on Your Baking Table
Brookies are the kind of indulgence that instantly elevates tea time, late-night cravings, or a simple weekend bake into something memorable.
As a professional recipe creator, I love desserts that bring texture contrasts and a comforting depth of flavor — and this hybrid cookie does both effortlessly. The experience is not just about sweetness; it’s about the interplay of a caramelized, nutty backdrop with a deep chocolate center that gives you both chew and fudginess in a single bite.
What makes this treat special is the layered approach to taste: the top notes of toasty butter, the mid-palate roundness from brown sugar, and the satisfying finish of glossy chocolate. When you pull a warm batch from the oven, the aroma alone promises comfort and decadence. In this introduction I’ll set expectations for texture and presentation, and offer a sense of what to focus on while baking — without repeating exact ingredient amounts or step-by-step numbers that are stored elsewhere in this article.
Baking brookies is an opportunity to practice two complementary techniques at once: coaxing butter into a richer, nuttier form and coaxing chocolate into a glossy, fudgy ribbon. The result is a cookie that feels artisanal yet approachable, perfect for gifting or keeping close by for quiet, delicious moments.
Below you’ll find the full ingredient list and detailed instructions in their own sections, followed by practical tips on ingredient selection, technique nuances, variations, and troubleshooting to help you produce consistent, bakery-quality results at home.
As a professional recipe creator, I love desserts that bring texture contrasts and a comforting depth of flavor — and this hybrid cookie does both effortlessly. The experience is not just about sweetness; it’s about the interplay of a caramelized, nutty backdrop with a deep chocolate center that gives you both chew and fudginess in a single bite.
What makes this treat special is the layered approach to taste: the top notes of toasty butter, the mid-palate roundness from brown sugar, and the satisfying finish of glossy chocolate. When you pull a warm batch from the oven, the aroma alone promises comfort and decadence. In this introduction I’ll set expectations for texture and presentation, and offer a sense of what to focus on while baking — without repeating exact ingredient amounts or step-by-step numbers that are stored elsewhere in this article.
Baking brookies is an opportunity to practice two complementary techniques at once: coaxing butter into a richer, nuttier form and coaxing chocolate into a glossy, fudgy ribbon. The result is a cookie that feels artisanal yet approachable, perfect for gifting or keeping close by for quiet, delicious moments.
Below you’ll find the full ingredient list and detailed instructions in their own sections, followed by practical tips on ingredient selection, technique nuances, variations, and troubleshooting to help you produce consistent, bakery-quality results at home.
Ingredients
Complete ingredient list
Below is the structured ingredient list for this brookies cookie recipe. Use the listed measurements when following the instruction steps in the dedicated section.
When assembling ingredients, opt for quality chocolate and freshly packed brown sugar — these choices have an outsized effect on final flavor. If you enjoy a slightly more tender crumb, choose a fine-textured flour and avoid overmixing the blondie base once the flour is folded in. For texture contrast, the semisweet chips bring pockets of chocolate that soften during baking while the dark chocolate ribbon offers a glossy, fudgy counterpoint.
Small-scale adjustments to ingredient temperature matter: room-temperature eggs integrate more smoothly with a warm, browned butter; very hot butter can cook the egg prematurely, while very cold butter can cause the batter to seize. Also consider the finish: a quick sprinkle of flaky sea salt after baking sharpens the chocolate and balances sweetness. This ingredient list is intentionally specific so the instructions that follow can reference exact measurements and sequencing.
Below is the structured ingredient list for this brookies cookie recipe. Use the listed measurements when following the instruction steps in the dedicated section.
- 115g unsalted butter (for browning)
- 150g light brown sugar
- 50g granulated sugar
- 1 large egg
- 1 tsp vanilla extract
- 180g all-purpose flour
- 1/2 tsp baking powder
- 1/4 tsp salt
- 100g semisweet chocolate chips
- 85g dark chocolate, chopped
- 40g unsalted butter (melted)
- 50g granulated sugar (for brownie swirl)
- 1 small egg (for brownie swirl)
- 15g cocoa powder
- 20g all-purpose flour (for brownie swirl)
- Pinch of salt
- Flaky sea salt for finishing (optional)
When assembling ingredients, opt for quality chocolate and freshly packed brown sugar — these choices have an outsized effect on final flavor. If you enjoy a slightly more tender crumb, choose a fine-textured flour and avoid overmixing the blondie base once the flour is folded in. For texture contrast, the semisweet chips bring pockets of chocolate that soften during baking while the dark chocolate ribbon offers a glossy, fudgy counterpoint.
Small-scale adjustments to ingredient temperature matter: room-temperature eggs integrate more smoothly with a warm, browned butter; very hot butter can cook the egg prematurely, while very cold butter can cause the batter to seize. Also consider the finish: a quick sprinkle of flaky sea salt after baking sharpens the chocolate and balances sweetness. This ingredient list is intentionally specific so the instructions that follow can reference exact measurements and sequencing.
Instructions
Step-by-step method
Follow the numbered steps below in order for the best structural and textural outcome. These instructions pair with the ingredient list above; each step is written to be clear and actionable for both home bakers and anyone seeking to replicate a bakery-style bake.
These steps preserve the integrity of the two distinct textures — the tender, caramelized blondie exterior and the glossy, fudgy brownie ribbon. Temperature control during integration of hot butter with egg is important; avoid adding scalding butter directly to eggs to prevent scrambling. Chilling both batters makes scooping neater and helps the swirl stay defined during baking. When swirling, aim for soft, intentional motions rather than aggressive mixing to maintain visible marbling and distinct textures in the finished cookie.
Follow the numbered steps below in order for the best structural and textural outcome. These instructions pair with the ingredient list above; each step is written to be clear and actionable for both home bakers and anyone seeking to replicate a bakery-style bake.
- Preheat oven and prepare baking sheets by lining with parchment paper.
- Make the browned butter: melt the specified portion of butter in a light-colored pan over medium heat, swirl regularly until foam subsides and brown flecks develop; remove from heat and allow to cool briefly.
- Whisk together brown sugar and granulated sugar, then add the large egg and vanilla; whisk until combined.
- Slowly stream warm (not hot) browned butter into the sugar-egg mixture, stirring until smooth.
- Fold in the flour, leavening, and salt until just combined; stir in chocolate chips to form the blondie dough.
- Prepare the brownie swirl by melting chopped dark chocolate with melted butter, cooling slightly, and combining with the sugar and small egg.
- Add cocoa, flour, and a pinch of salt to the chocolate mixture until glossy and thick; chill briefly if needed to thicken for scooping.
- Chill both batters briefly so they’re easier to scoop, then portion the blondie dough onto the prepared sheets and top each with a small spoonful of brownie batter.
- Use a skewer or spoon to gently swirl the brownie into the blondie to create a marbled effect; press optional extra chips on top and finish with flaky sea salt if desired.
- Bake until edges are set and centers remain soft; cool on the baking sheet briefly before transferring to a wire rack to finish cooling. Serve warm or at room temperature.
These steps preserve the integrity of the two distinct textures — the tender, caramelized blondie exterior and the glossy, fudgy brownie ribbon. Temperature control during integration of hot butter with egg is important; avoid adding scalding butter directly to eggs to prevent scrambling. Chilling both batters makes scooping neater and helps the swirl stay defined during baking. When swirling, aim for soft, intentional motions rather than aggressive mixing to maintain visible marbling and distinct textures in the finished cookie.
Gathering Ingredients
Selecting and preparing ingredients like a pro
Gathering the right components sets the tone for success in this recipe. Think of this step as assembling a toolkit where each item performs a specific role in texture, flavor, and structure. Choose high-quality chocolate with a cocoa percentage that suits your taste — a darker chocolate will create a deeper, more bittersweet ribbon while a mid-range chocolate will read sweeter and more approachable. For the butter, opt for a fresh block of unsalted butter so you can control seasoning and the nutty aroma that emerges when you brown it.
Pay attention to sugar types: light brown sugar contributes molasses flavor and moisture, whereas granulated sugar adds lift and snap. When shopping, pick brown sugar that’s soft and a bit moist; if it’s rock-hard, rejuvenate it briefly before use. Use whole, fresh eggs at room temperature for better emulsion and more cohesive dough. If you plan to use flaky sea salt as a finish, have it ready in a small dish so it can be scattered immediately after the cookies come out of the oven.
Organization is key: lay out each ingredient in small bowls, arrange measuring implements, and have your baking sheets and parchment ready. This mise en place approach keeps the workflow fluid and reduces the risk of missing a step. For the chocolate components, one portion should be in chip form to offer pockets of melting chocolate, while another should be chopped for melting into the brownie ribbon. Having both textures of chocolate arranged ahead of time makes the assembly and swirling process smoother.
Image description: a warm, inviting counter scene with labeled bowls of chocolate, a block of butter beginning to brown in a light-colored pan, and neatly arranged measuring spoons and eggs — styled like a professional kitchen prep shot.
Gathering the right components sets the tone for success in this recipe. Think of this step as assembling a toolkit where each item performs a specific role in texture, flavor, and structure. Choose high-quality chocolate with a cocoa percentage that suits your taste — a darker chocolate will create a deeper, more bittersweet ribbon while a mid-range chocolate will read sweeter and more approachable. For the butter, opt for a fresh block of unsalted butter so you can control seasoning and the nutty aroma that emerges when you brown it.
Pay attention to sugar types: light brown sugar contributes molasses flavor and moisture, whereas granulated sugar adds lift and snap. When shopping, pick brown sugar that’s soft and a bit moist; if it’s rock-hard, rejuvenate it briefly before use. Use whole, fresh eggs at room temperature for better emulsion and more cohesive dough. If you plan to use flaky sea salt as a finish, have it ready in a small dish so it can be scattered immediately after the cookies come out of the oven.
Organization is key: lay out each ingredient in small bowls, arrange measuring implements, and have your baking sheets and parchment ready. This mise en place approach keeps the workflow fluid and reduces the risk of missing a step. For the chocolate components, one portion should be in chip form to offer pockets of melting chocolate, while another should be chopped for melting into the brownie ribbon. Having both textures of chocolate arranged ahead of time makes the assembly and swirling process smoother.
Image description: a warm, inviting counter scene with labeled bowls of chocolate, a block of butter beginning to brown in a light-colored pan, and neatly arranged measuring spoons and eggs — styled like a professional kitchen prep shot.
Cooking Process
Key technique notes from a baker’s perspective
The cooking process for these brookies is where technical care elevates the simple idea of a cookie into a layered, bakery-style treat. Focus on three critical transitions: transforming butter into browned butter, marrying warm butter with egg without curdling, and achieving a fudgy swirl that remains distinct within the blondie matrix. Browning butter is a sensory exercise — watch for the change in color, sniff for nuttiness, and listen for a gentle decrease in foaming. Remove the pan from heat at the right moment for the best aromatic profile.
When you integrate warm butter with egg and sugar, pour slowly and stir continually; the goal is a smooth, satiny batter rather than fragmented bits. Temperature management continues into the swirl stage: the brownie ribbon should be glossy and thick enough to hold shape when spooned atop the blondie portions. If the ribbon is too loose, brief chilling firm it up while keeping it spreadable.
Swirling demands a light touch. Use a thin skewer or the tip of a spoon to make soft, intentional marbling strokes. Overworking blends the two batters entirely and loses the visual appeal and textural contrast. During baking, look for a set edge with a slightly jiggly center — that arresting moment preserves a fudgy core while letting the exterior set into a tender blondie cookie. Cool briefly on the sheet so the structure stabilizes before moving cookies to a rack.
Image description: an action shot of a baker swirling glossy dark chocolate into pale, speckled blondie dough on parchment-lined sheets, with a small bowl of flaky sea salt nearby and a wooden skewer mid-swirl.
The cooking process for these brookies is where technical care elevates the simple idea of a cookie into a layered, bakery-style treat. Focus on three critical transitions: transforming butter into browned butter, marrying warm butter with egg without curdling, and achieving a fudgy swirl that remains distinct within the blondie matrix. Browning butter is a sensory exercise — watch for the change in color, sniff for nuttiness, and listen for a gentle decrease in foaming. Remove the pan from heat at the right moment for the best aromatic profile.
When you integrate warm butter with egg and sugar, pour slowly and stir continually; the goal is a smooth, satiny batter rather than fragmented bits. Temperature management continues into the swirl stage: the brownie ribbon should be glossy and thick enough to hold shape when spooned atop the blondie portions. If the ribbon is too loose, brief chilling firm it up while keeping it spreadable.
Swirling demands a light touch. Use a thin skewer or the tip of a spoon to make soft, intentional marbling strokes. Overworking blends the two batters entirely and loses the visual appeal and textural contrast. During baking, look for a set edge with a slightly jiggly center — that arresting moment preserves a fudgy core while letting the exterior set into a tender blondie cookie. Cool briefly on the sheet so the structure stabilizes before moving cookies to a rack.
Image description: an action shot of a baker swirling glossy dark chocolate into pale, speckled blondie dough on parchment-lined sheets, with a small bowl of flaky sea salt nearby and a wooden skewer mid-swirl.
Texture and Flavor Profile — What to Expect
Sensation, balance, and tasting notes
Expect a multidimensional bite where contrast is the star. The blondie portion carries a tender chew and a rich, caramelized butter note that frames the cookie. Interspersed chocolate chips provide molten pockets that soften when warm yet retain their shape as the cookie cools, offering delightful pockets of concentrated chocolate. The brownie ribbon brings a darker, more concentrated cocoa depth and a fudgy, almost ganache-like texture that contrasts the blondie’s brightness.
Flavor balance is thoughtfully layered: the brown sugar provides molasses warmth that complements the nutty browned butter, while the dark chocolate ribbon delivers a more bitter-sweet base to offset the overall sweetness. If you choose to finish with a flake of sea salt, that quick spark of salinity sharpens the chocolate and rounds out the sweetness, pulling the components into a harmonious whole.
When fresh from the oven, textures are at their most dramatic — the blondie is soft, the brownie ribbon molten and glossy, and the chips are melty. As the cookies cool, the outer edge firms slightly, creating a pleasant chew-to-crisp transition that many find irresistible. For serving, warm cookies provide a sensory peak — gooey centers and melting chocolate — while cooled cookies present cleaner slices and a more uniform mouthfeel. Both are excellent; your preference will guide whether you serve them warm or at room temperature.
Expect a multidimensional bite where contrast is the star. The blondie portion carries a tender chew and a rich, caramelized butter note that frames the cookie. Interspersed chocolate chips provide molten pockets that soften when warm yet retain their shape as the cookie cools, offering delightful pockets of concentrated chocolate. The brownie ribbon brings a darker, more concentrated cocoa depth and a fudgy, almost ganache-like texture that contrasts the blondie’s brightness.
Flavor balance is thoughtfully layered: the brown sugar provides molasses warmth that complements the nutty browned butter, while the dark chocolate ribbon delivers a more bitter-sweet base to offset the overall sweetness. If you choose to finish with a flake of sea salt, that quick spark of salinity sharpens the chocolate and rounds out the sweetness, pulling the components into a harmonious whole.
When fresh from the oven, textures are at their most dramatic — the blondie is soft, the brownie ribbon molten and glossy, and the chips are melty. As the cookies cool, the outer edge firms slightly, creating a pleasant chew-to-crisp transition that many find irresistible. For serving, warm cookies provide a sensory peak — gooey centers and melting chocolate — while cooled cookies present cleaner slices and a more uniform mouthfeel. Both are excellent; your preference will guide whether you serve them warm or at room temperature.
Variations and Substitutions
Creative swaps without losing the soul of the cookie
This brookies framework is flexible. Swap chocolate types to tune bitterness and sweetness — try a higher-cocoa dark chocolate for a more intense ribbon or a milk-dominant chocolate for a creamier note. For nutty interest, fold in toasted, chopped nuts into the blondie portion, or press a few toasted hazelnuts on top of each cookie before baking to add crunch and flavor complexity. If you prefer a dairy-free version, use a high-quality plant-based butter alternative for both the browning and the melted component, and choose dairy-free chocolate options; texture will be similar if fats and solid content are matched carefully.
For a spiced twist, add a small pinch of warming spices to the blondie batter — think a whisper of ground cinnamon or a hint of finely grated orange zest — but keep additions subtle to avoid overpowering the chocolate contrast. To transform these brookies into sandwich cookies, bake slightly flatter scoops and sandwich with a dollop of chocolate ganache or salted caramel between two cooled rounds. For portion control or bite-size party treats, scale the scoops down and shorten bake time accordingly; smaller portions change the bake dynamics and yield crispier edges to center ratios.
Remember: substitutions that affect moisture or fat content may alter texture; adjust by compensating with small changes in binding ingredients or chilling time. Test on a small batch first to confirm your chosen swap behaves as expected in your oven and climate.
This brookies framework is flexible. Swap chocolate types to tune bitterness and sweetness — try a higher-cocoa dark chocolate for a more intense ribbon or a milk-dominant chocolate for a creamier note. For nutty interest, fold in toasted, chopped nuts into the blondie portion, or press a few toasted hazelnuts on top of each cookie before baking to add crunch and flavor complexity. If you prefer a dairy-free version, use a high-quality plant-based butter alternative for both the browning and the melted component, and choose dairy-free chocolate options; texture will be similar if fats and solid content are matched carefully.
For a spiced twist, add a small pinch of warming spices to the blondie batter — think a whisper of ground cinnamon or a hint of finely grated orange zest — but keep additions subtle to avoid overpowering the chocolate contrast. To transform these brookies into sandwich cookies, bake slightly flatter scoops and sandwich with a dollop of chocolate ganache or salted caramel between two cooled rounds. For portion control or bite-size party treats, scale the scoops down and shorten bake time accordingly; smaller portions change the bake dynamics and yield crispier edges to center ratios.
Remember: substitutions that affect moisture or fat content may alter texture; adjust by compensating with small changes in binding ingredients or chilling time. Test on a small batch first to confirm your chosen swap behaves as expected in your oven and climate.
Storage, Reheating, and Serving Suggestions
Keeping brookies delicious between bakes
These cookies store well when treated thoughtfully. For short-term enjoyment, keep them in a single layer in an airtight container at room temperature with a small sheet of parchment between layers to prevent sticking. For longer storage, freezing fully cooled cookies on a tray then transferring to a freezer-safe bag preserves texture and flavor; thaw at room temperature when ready to enjoy.
Reheating a previously cooled cookie brings back that freshly-baked sensation. Use a gentle heat source to warm just until the center softens again — avoid prolonged or very high heat, which can dry the blondie portion and dull the gloss of the brownie ribbon. If you like a softer edge, wrap a cookie loosely in foil and use a low oven; for a quick revive, a few seconds in a dry skillet over gentle heat can also do the trick while reactivating chocolate melt.
Serving ideas: present them slightly warm alongside a simple scoop of vanilla ice cream for contrast, or pair with a robust coffee to offset the sweetness. For gatherings, arrange on a platter with small labels indicating any variations (nuts, dairy-free) so guests can select according to preference. Because these brookies marry two textures, they work well on dessert platters where textural contrast is prized and can be dressed up with a light dusting of cocoa or a very light sprinkle of flaky sea salt for a finishing touch.
These cookies store well when treated thoughtfully. For short-term enjoyment, keep them in a single layer in an airtight container at room temperature with a small sheet of parchment between layers to prevent sticking. For longer storage, freezing fully cooled cookies on a tray then transferring to a freezer-safe bag preserves texture and flavor; thaw at room temperature when ready to enjoy.
Reheating a previously cooled cookie brings back that freshly-baked sensation. Use a gentle heat source to warm just until the center softens again — avoid prolonged or very high heat, which can dry the blondie portion and dull the gloss of the brownie ribbon. If you like a softer edge, wrap a cookie loosely in foil and use a low oven; for a quick revive, a few seconds in a dry skillet over gentle heat can also do the trick while reactivating chocolate melt.
Serving ideas: present them slightly warm alongside a simple scoop of vanilla ice cream for contrast, or pair with a robust coffee to offset the sweetness. For gatherings, arrange on a platter with small labels indicating any variations (nuts, dairy-free) so guests can select according to preference. Because these brookies marry two textures, they work well on dessert platters where textural contrast is prized and can be dressed up with a light dusting of cocoa or a very light sprinkle of flaky sea salt for a finishing touch.
Troubleshooting and Pro Tips
Solutions to common hiccups and professional baking tips
If your browned butter tastes bitter or smells burnt, you likely overshot the browning window — discard it and start with a fresh block, watching the color and aroma carefully. If the blondie dough is too loose to hold shape for scooping, a brief chill in the fridge firms the dough without compromising tenderness. Conversely, if the brownie ribbon is overly stiff after chilling, let it sit at room temperature a bit before spooning so it can be swirled smoothly.
To avoid overbaking, remove cookies at the moment edges appear set and centers still have a gentle jiggle; they will continue to set as they cool. If your oven runs hot or cool, use an oven thermometer and adjust placement of racks or temperature settings accordingly. For even bake color, rotate the sheet halfway through the bake if your oven has hot spots.
When swirling, less is more: aim for visual definition rather than complete blending. If you want more pronounced chocolate ribbons, use slightly thicker brownie batter and a firmer scoop so the swirl remains distinct. Finally, for consistent sizing and baking, portion dough with a scoop and weigh or measure the number of scoops per tray so each cookie has similar bake dynamics. Keeping notes about oven adjustments, altitude, and ingredient swaps will pay dividends in future bakes.
If your browned butter tastes bitter or smells burnt, you likely overshot the browning window — discard it and start with a fresh block, watching the color and aroma carefully. If the blondie dough is too loose to hold shape for scooping, a brief chill in the fridge firms the dough without compromising tenderness. Conversely, if the brownie ribbon is overly stiff after chilling, let it sit at room temperature a bit before spooning so it can be swirled smoothly.
To avoid overbaking, remove cookies at the moment edges appear set and centers still have a gentle jiggle; they will continue to set as they cool. If your oven runs hot or cool, use an oven thermometer and adjust placement of racks or temperature settings accordingly. For even bake color, rotate the sheet halfway through the bake if your oven has hot spots.
When swirling, less is more: aim for visual definition rather than complete blending. If you want more pronounced chocolate ribbons, use slightly thicker brownie batter and a firmer scoop so the swirl remains distinct. Finally, for consistent sizing and baking, portion dough with a scoop and weigh or measure the number of scoops per tray so each cookie has similar bake dynamics. Keeping notes about oven adjustments, altitude, and ingredient swaps will pay dividends in future bakes.
Frequently Asked Questions (FAQs)
Answers to common reader questions
If you have other questions about adapting the recipe for dietary needs or equipment differences, tell me what changes you’re thinking of and I’ll offer tailored guidance based on professional baking techniques and ingredient behavior.
- Can I make the dough ahead?
Yes — you can prepare the components ahead of time and chill them; this helps with scooping and often improves flavor development. - How do I prevent the swirl from blending completely?
Use a gentle swirling motion and avoid deep stirring; slightly thicker brownie batter helps maintain ribbon definition. - Can I substitute the chocolate?
Yes — feel free to choose chocolate types to adjust sweetness and cocoa intensity, keeping in mind that different chocolates melt and behave slightly differently. - Why is browning the butter necessary?
Browning develops a nutty, caramel-like complexity that enhances the blondie base and deepens overall flavor. - How should I reheat leftovers?
Warm gently to revive the gooey center and soften chocolate; avoid high, dry heat that can dry the blondie portion.
If you have other questions about adapting the recipe for dietary needs or equipment differences, tell me what changes you’re thinking of and I’ll offer tailored guidance based on professional baking techniques and ingredient behavior.
Brookies Cookies — Browned Butter Blondie with Fudgy Brownie Swirl
Meet the ultimate indulgence: Brookies Cookies! A browned-butter blondie cookie studded with chocolate chips and a fudgy brownie swirl 🍪🧈🍫 — warm, gooey, and impossible to resist.
Prep: 50 Cals: 360 kcal Serves: 12
ingredients
- 115g unsalted butter (for browning) 🧈
- 150g light brown sugar 🍬
- 50g granulated sugar 🍚
- 1 large egg 🥚
- 1 tsp vanilla extract 🌼
- 180g all-purpose flour 🌾
- 1/2 tsp baking powder 🧁
- 1/4 tsp salt 🧂
- 100g semisweet chocolate chips 🍫
- 85g dark chocolate, chopped 🍫
- 40g unsalted butter (melted) 🧈
- 50g granulated sugar 🍚
- 1 small egg 🥚
- 15g cocoa powder 🍫
- 20g all-purpose flour 🌾
- Pinch of salt 🧂
- Flaky sea salt for finishing (optional) 🧂
instructions
- 1 1. Preheat oven to 175°C (350°F). Line two baking sheets with parchment paper.
- 2 2. Make the browned butter: melt 115g butter in a light-colored pan over medium heat. Swirl often; foam will form, then brown specks appear and a nutty aroma develops (about 5–7 minutes). Remove from heat and let cool 5 minutes.
- 3 3. In a bowl, whisk together 150g light brown sugar and 50g granulated sugar. Add 1 egg and 1 tsp vanilla; whisk until combined.
- 4 4. Slowly pour the warm (not hot) browned butter into the sugar-egg mixture, stirring until smooth.
- 5 5. Fold in 180g flour, 1/2 tsp baking powder and 1/4 tsp salt until just combined. Stir in 100g semisweet chocolate chips. The blondie dough should be soft and slightly sticky.
- 6 6. Prepare the brownie swirl: place 85g chopped dark chocolate and 40g butter in a microwave-safe bowl and melt in 20–30 second bursts, stirring until smooth. Let cool slightly.
- 7 7. In a small bowl whisk 50g granulated sugar with 1 small egg until combined. Stir the melted chocolate mixture into the egg-sugar mixture.
- 8 8. Add 15g cocoa powder, 20g flour and a pinch of salt to the chocolate mixture; mix until glossy and thick. If too loose, chill 5–10 minutes to thicken slightly.
- 9 9. Chill both batters briefly (about 10 minutes) so they’re easier to scoop. Scoop 12 even portions of the blondie dough (about 1.5 tbsp each) onto the prepared sheets, spacing ~5 cm apart.
- 10 10. Place a teaspoon of brownie batter on top of each blondie portion. Using a skewer or spoon, gently swirl the brownie into the blondie to create a marbled effect. Press a few extra chocolate chips on top if desired and sprinkle with flaky sea salt.
- 11 11. Bake for 11–14 minutes, until edges are set and centers are still soft and slightly jiggly. Do not overbake to keep the fudgy texture.
- 12 12. Cool on the baking sheet for 8–10 minutes, then transfer to a wire rack to cool further. Serve warm or at room temperature.
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