Brown Butter Brookies Are the Perfect Fudgy and Chewy Dessert

By:

Gabriella Brotherton

Published:

September 28, 2026

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Brown Butter Brookies

Brown butter brookies layer a fudgy brown butter brownie with a chewy chocolate chip cookie, which means you get two very different textures in a single bar.

The two batters are layered in a specific order so both layers bake evenly and neither one overbakes. The finished pan cuts into 16 to 24 bars and feeds a crowd.

Jump to:

Why you’ll love these Brookies:

There is a lot to love about these bars, and it mostly comes down to texture.

Two textures, one bite. One layer is a rich, fudgy chocolate brownie. The other is a chewy chocolate chip cookie.
Smart layering. The chewy cookie dough sits between and on top of the brownie batter. The layers are arranged so each one keeps its intended chewy or fudgy texture instead of one texture being sacrificed for the other.
Built for a crowd. The bars can be cut into small slices to feed a large group, which makes them a natural fit for parties, potlucks, and bake sales.
Brown butter depth. Browning the butter first adds a nutty, caramel like flavor that plain melted butter simply does not have.
Easy to make ahead. The bars cool, slice, and store well, so you can bake them the day before your gathering.

The first time I brought a tray of these to a neighborhood potluck, I set them on the table and turned around to grab a serving spoon.

By the time I turned back, half the tray was gone and someone was asking who made the brownies with the cookie in the middle. That is exactly the kind of moment I love about shared food.

Brown Butter Brookies, Why You'Ll Love These Brookies — Brown Butter Brookies Are The Perfect Fudgy And Chewy Dessert 31

These bars look impressive, but the method behind them is simple enough for a weeknight baking session.

They also travel well. Because the bars are sturdy once cooled, they stack neatly in a container and hold up on the drive to a picnic or a family dinner. If you like a sweet and salty finish, a little flaky sea salt on top pulls everything together.

Ingredient Overview:

The full recipe with measurements and directions is in the recipe card at the bottom of the post, and the table of contents near the top below the first image can help you jump around.

Here is the reasoning behind a few key choices before you start measuring.

Salted butter. Salted butter is used for the best flavor, and unsalted butter can be substituted if that is what you keep on hand. Butter shows up in both the cookie layer and the brownie layer, so it does a lot of work here.
Vegetable oil. Vegetable oil stays liquid at room temperature, unlike butter, and that helps keep baked goods tender and moist. Swapping some of the butter for oil in the brownies adds moisture without sacrificing flavor.
Two sugars in the brownies. Granulated sugar and powdered sugar are combined because it helps the sugar dissolve completely. Dissolving the sugars is the key to getting that shiny, paper thin top on the brownies.
Cocoa powder. The brownie layer contains no baking powder or baking soda, so any cocoa powder works here. Dutch process, natural, or black cocoa all work. Black cocoa gives the brownies a deeper, cookie like chocolate flavor.

Here is how the two layers break down.

Amount	For the Chocolate Chip Cookies
14.5 tbsp	salted butter
3/4 cup	dark brown sugar, packed
3/4 cup	granulated sugar
2	large eggs, at room temperature
1 and 1/2 tsp	vanilla extract
3 cups	all purpose flour, spooned and leveled or weighed out
1 tsp	baking soda
1 tsp	baking powder
1/2 tsp	salt
1 and 1/2 cups	chocolate chips

Amount	For the Brownies
3/4 cup	salted butter, cubed, 170 grams before browning and 140 grams after
4 ounces	semi sweet chocolate, chopped, chocolate chips work too
1/4 cup	vegetable oil
3/4 cup	cocoa powder
3	large eggs, at room temperature
1	large egg yolk, at room temperature
3/4 cup	granulated sugar
1 and 1/2 cups	powdered sugar
2 tsp	vanilla extract
1/4 tsp	salt
1/2 cup	all purpose flour, spooned and leveled or weighed out
pinch	espresso powder, optional
1 cup	semi sweet chocolate chips

For topping, flaky sea salt is optional but lovely.

If you like to plan your day around nutrition numbers, the source lists about 680 calories per bar, along with 84 grams of carbohydrates, 37 grams of fat, and 7 grams of protein.

Recipe Variations:

These bars are easy to adapt in a couple of simple ways.

Dairy free version. Use your favorite dairy free butter and dairy free chocolate. Everything else stays the same.
Smaller yield. Halve the recipe and bake it in a 9×9 metal pan instead of the larger pan.
Do not double it. Doubling the recipe is not recommended because the layers will not bake properly in one pan. Make two separate batches instead, which also gives you a chance to bake one while the other waits.

How to Make the best Brookies:

This recipe has two components that come together in one pan. Take them one at a time and the whole thing feels calm and organized.

Prep. Preheat the oven to 350 degrees Fahrenheit. Spray a 9×13 metal pan with nonstick spray and line it with parchment paper. The parchment makes removal and slicing much easier later.
Make the chocolate chip cookie dough. Melt the butter in a large mixing bowl. Whisk in the sugars. Add the eggs and vanilla and whisk until smooth and combined, about 30 to 45 seconds. Stir in the dry ingredients, then the chocolate chips last. Divide the dough into two equal halves, about 640 grams each. Press one half into the prepared pan, then lift out that piece of parchment paper and replace it with a new piece. Set your layer of cookie dough aside and leave the rest of the dough in the bowl for later.
Brown the butter. Add the cubed butter to a medium saucepan over medium heat and melt it, stirring occasionally. Once it is melted, turn the heat down to medium low and keep cooking, stirring frequently. The butter will get foamy and bubbly, then turn a deep golden color with a nutty, caramel like aroma. This takes about 3 to 6 minutes once the butter has melted.
Make the brownie batter. Stir the semi sweet chocolate into the browned butter until it is completely melted, then whisk in the vegetable oil and cocoa powder. Set aside to cool slightly. In a large mixing bowl, add the eggs, egg yolk, and granulated sugar. Whisk for about 1 to 2 minutes, until the sugar is fully dissolved. Feel the mixture between your fingers. If it is completely smooth you are good, and if you feel sugar granules, keep whisking. Next, whisk in the powdered sugar, vanilla, and salt. Check that the chocolate mixture is no longer piping hot, though it will still be quite warm, then whisk it into the bowl of eggs and sugar. Fold in the flour and espresso powder, then the chocolate chips.

The sugar really does need to dissolve. That short whisking step is what gives the brownie layer its shiny top and that soft, fudgy crumb.

Time Saving Tip:

If you are short on time, you can skip browning the butter. Just know that browning evaporates water, so the finished volume is less than what you started with. When you skip that step, begin with 140 grams of melted butter instead of 170 grams.

Once both components are ready, assemble the pan in this order.

Spread slightly more than half of the brownie batter in the bottom of the lined 9×13 pan. You can just eyeball it.
Lay the sheet of cookie dough on top of the batter and remove that extra piece of parchment paper.
Spread the remaining brownie batter over the cookie dough layer.
Form large, thick discs with the remaining cookie dough and set them on top of the batter.
Press extra chocolate chips into any bare spots on the cookie dough if you like.

Bake at 350 degrees Fahrenheit for 38 to 44 minutes. The cookies should be golden and the brownies should have a shiny top. A toothpick inserted into the center of a brownie spot should come out with some moist crumbs, but not wet batter. Do not overbake.

Let the bars cool in the pan on a wire rack for about 1 to 2 hours before slicing and serving. Sprinkle flaky sea salt on top if you like.

Store leftover bars, cooled, in an airtight container at room temperature for 3 to 4 days. Warming a leftover slice in the microwave for a few seconds brings back that fresh from the oven softness, and I highly recommend it.

Can I freeze Brookies?

Yes, and they freeze beautifully, which is handy when you bake a full pan for a small household.

Let the bars cool completely before freezing.
Wrap pieces in pairs using plastic wrap or foil.
Place the wrapped pieces in a freezer container and freeze for 4 to 6 weeks.
Thaw on the counter for a few hours before enjoying.

This is my favorite way to keep a few bars on hand for surprise visitors. They taste just as good after thawing, and a quick warm up makes them taste even better.

Expert Baking Tips:

Two inexpensive tools make a real difference in how reliably these bars turn out.

An oven thermometer. It reveals whether your oven is actually running at the temperature you set, since ovens can be inaccurate. Accurate oven temperature matters for most bakes, so keeping a thermometer in the oven at all times is an easy way to monitor calibration.
A kitchen scale. It is the best way to make sure your flour is at the proper weight. Flour amounts vary widely depending on how the flour is measured and on the measuring cup used, because measuring cups are not standardized.

One more detail that helps: because the brownie layer contains no baking powder or baking soda, any cocoa powder you have works. Natural, dutch process, and black cocoa are all fine choices, so you can bake these without a special shopping trip.

Brown Butter Brookies, Expert Baking Tips — Brown Butter Brookies Are The Perfect Fudgy And Chewy Dessert 37

If you only adopt one habit from this post, weigh your flour. It is the single easiest way to keep the cookie layer chewy and the brownie layer fudgy.

Special Tools:

A metal 9×13 pan is essential for this recipe. Metal conducts heat better and more evenly than glass, which makes it the best baking option for layered bars like these.

Pan Material	How It Performs Here
Metal	Best choice. Heats evenly and gives the most predictable bake.
Ceramic	A solid second choice when metal is not available.
Glass	Last choice for this recipe because it heats less evenly.

You will also want parchment paper, a medium saucepan for browning the butter, a couple of large mixing bowls, and a whisk. A wire rack for cooling helps the bars set up evenly, and a sharp knife gives you clean slices once they have cooled completely.

FAQs

What are brookies made of?

Brookies are a hybrid dessert bar made by layering fudgy brownie batter with chewy chocolate chip cookie dough. This recipe uses a brown butter brownie layer with cocoa powder, semi-sweet chocolate, and chocolate chips, paired with a butter-based chocolate chip cookie layer. The combination creates a rich, two-texture bar that serves 16 to 24 people.

How do you layer brownie and cookie batter for brookies?

Spread slightly more than half the brownie batter in the bottom of a parchment-lined 9×13 metal pan. Place a pre-formed sheet of cookie dough on top, then spread the remaining brownie batter over it. Finally, press large discs of the remaining cookie dough onto the top and bake at 350°F for 38 to 44 minutes.

What is the secret to fudgy brookies?

The key to fudgy brookies is using a brownie recipe with both melted butter and vegetable oil, as oil stays liquid at room temperature for extra moisture. Additionally, using a combination of granulated and powdered sugar in the brownie batter helps create a shiny, crackly top while keeping the interior dense and fudgy. Avoid overbaking; a toothpick inserted into a brownie spot should come out with moist crumbs, not wet batter.

Can you freeze brookies?

Yes, brookies freeze well for 4 to 6 weeks. Cool the baked bars completely, then wrap them in pairs in plastic wrap or foil and place them in a freezer-safe container. To serve, thaw the bars on the counter for a few hours, and reheat slices in the microwave for the best fresh-from-the-oven texture.