Brown Butter Brookies

The moment the rich, nutty aroma of browned butter fills your kitchen, you know something special is on the way. Brown Butter Brookies are an indulgent fusion of two beloved desserts: cookies and brownies. This recipe takes about an hour from start to finish, yielding a delicious bar that balances the chewiness of cookies with the fudgy decadence of brownies, all enhanced by the deep flavor of browned butter.

These bars are perfect for any occasion, whether you’re hosting a gathering or simply treating yourself during the week. You can make them ahead of time and store them easily for later decadence.

Why You’ll Love This Recipe

• The browning of the butter adds an incredible depth of flavor.
• You get two desserts in one, satisfying both brownie and cookie cravings.
• Their warm, gooey texture is irresistible when fresh out of the oven.
• They are easy to cut and serve, making them great for parties.

What You’ll Need

Gather these ingredients to create delectable Brown Butter Brookies.

For the Cookie Dough

• 14.5 tbsp salted butter, melted (206 grams)
• 3/4 cup dark brown sugar, packed (163 grams)
• 3/4 cup granulated sugar (156 grams)
• 2 large eggs, at room temperature
• 1 and 1/2 tsp vanilla extract
• 3 cups all-purpose flour, spooned & leveled or weighed out (390 grams)
• 1 tsp baking soda
• 1 tsp baking powder
• 1/2 tsp salt
• 1 and 1/2 cups chocolate chips

For the Brownie Batter

• 3/4 cup salted butter, cubed (170 grams before browning, 140 grams after)
• 4 ounces semi-sweet chocolate, chopped (chocolate chips work, too)
• 1/4 cup vegetable oil (56 mL)
• 3/4 cup cocoa powder (63 grams)
• 3 large eggs, at room temperature
• 1 large egg yolk, at room temperature
• 3/4 cup granulated sugar (158 grams)
• 1 and 1/2 cups powdered sugar (174 grams)
• 2 tsp vanilla extract
• 1/4 tsp salt
• 1/2 cup all-purpose flour (65 grams)
• Pinch of espresso powder (optional)
• 1 cup semi-sweet chocolate chips
• Flaky sea salt, optional for topping

Note: Make sure the butter is unsalted for a balanced flavor.

Substitutions & Swaps

• Dark brown sugar can be substituted with light brown sugar.
• Use coconut oil instead of vegetable oil for a different flavor.
• All-purpose flour can be replaced with a 1:1 gluten-free blend.
• Add chopped nuts if you enjoy a crunchy texture.

How to Make It

Get ready for a delightful baking experience with these straightforward steps.

1. Prep

Preheat your oven to 350℉. Spray a 9×13 metal pan with nonstick spray and line with parchment paper for easy removal and slicing.

2. Make the Chocolate Chip Cookie Dough

Melt the butter in a large mixing bowl. Whisk in the sugars until smooth and combined, about 30-45 seconds. Add the eggs and vanilla, mixing well. Stir in the dry ingredients, followed by the chocolate chips. Divide the dough into two equal halves (about 640 grams each). Press one half into the prepared pan, press down firmly, then lift out the parchment paper and set aside the dough.

3. Brown the Butter

Add cubed butter to a medium saucepan over medium heat. Melt the butter, stirring occasionally. Once melted, turn the heat to medium-low, continuing to cook, stirring frequently. The butter will foam, bubble, and then turn a deep golden shade with a nutty aroma, taking about 3-6 minutes.

4. Make the Brownie Batter

Once the butter is browned, stir in the semi-sweet chocolate until completely melted. Whisk in the vegetable oil and cocoa powder, then set aside to cool slightly. In a large mixing bowl, add the eggs, egg yolk, and granulated sugar. Whisk for about 1-2 minutes until the sugar is fully dissolved. Add the powdered sugar, vanilla, and salt, whisking well. Gently incorporate the slightly cooled chocolate mixture into the egg and sugar mix. Fold in the flour and espresso powder, followed by the chocolate chips.

5. Assemble

Spread slightly more than half of the brownie batter in the bottom of your lined 9×13 pan. Lay the cookie dough on top, removing the parchment paper. Spread the remaining brownie batter over the cookie dough. Form large, thick discs from the remaining cookie dough and place them on top of the brownie layer, pressing extra chocolate chips into any bare spots if desired.

6. Bake

Bake the assembled brookies for 38 to 44 minutes. The cookies should be golden and the brownies glossy on top. A toothpick inserted in a brownie spot will come out with some moist crumbs, but not wet batter. Be careful not to overbake!

How to Store It

Fridge: Store cooled bars in an airtight container for 3-4 days.
Freezer: Yes, they freeze well for up to two months.
Reheat: Microwave for 10-15 seconds for a warm treat.

Tips for Best Results

• Allow the browned butter to cool slightly before mixing with the eggs to prevent scrambling.
• Make sure to press the cookie dough layers firmly to ensure they adhere together while baking.
• Use quality chocolate chips for a richer flavor.
• Don’t skip the flaky sea salt; it enhances the sweetness beautifully.

Serving Suggestions

• Pair with a scoop of vanilla ice cream for a special dessert.
• Serve at gatherings for both kids and adults to enjoy.
• Great with coffee for an afternoon pick-me-up.