3Prepare the cookie layer: Mix flour, baking soda, and salt.
4Set aside the dry ingredients for the cookie layer.
5Combine melted butter, brown and granulated sugar, egg, and vanilla for the cookie layer.
6Whisk until smooth and fluffy for about 2-3 min for the cookie layer.
7Add dry ingredients and chocolate chips to the wet ingredients for the cookie layer.
8Mix until just combined for the cookie layer.
9Prepare the brownie layer: Melt butter in a saucepan over medium-low heat.
10Stir every 10 seconds until foamy (6-8 minutes).
11Continue until milk solids turn golden brown and smell nutty.
12Transfer browned butter to a heatproof bowl.
13Add cocoa powder, oil, vanilla, and chopped chocolate to the browned butter; mix until smooth.
14In a separate bowl Whisk 3 eggs and light brown sugar for 5-6 minutes until dissolved.
15Add powdered sugar; mix 1-2 minutes until combined.
16Add cooled browned butter mixture; mix until smooth.
17Add flour and chocolate chips; mix until well combined.
18Layer the cookie and brownie batters in the prepared pan.
19Bake for 50-55 minutes or until the edges are golden and center is a little jiggly.
20Let cool completely before cutting into brookies.
Ingredients
0.5 cups unsalted butter, melted and cooled
0.5 cup light brown sugar
0.33 cup granulated sugar
1 large egg, room temp
1 tbsp vanilla extract
1.25 cups all-purpose flour, spooned and leveled
0.5 tsp baking soda
0.5 tsp flaky sea salt
1.5 cups semi-sweet chocolate chips
1 cup unsalted butter
0.5 cup Dutch-processed cocoa powder
1 tsp vanilla
0.5 cup light brown sugar, spooned and leveled
1.75 cup powdered sugar
0.75 cup semi-sweet chocolate chips
0.33 cup semi-sweet chocolate, chopped
3 eggs, room temp
0.5 cup all-purpose flour
1 Pinch salt
3 tbsp olive oil
Equipment
8x8 inch panparchment papersaucepanheatproof bowl
Tips
Dissolving sugar in eggs ensures a crackly top.
You can adjust the layering to your preference, either by layering the cookie dough on top of the brownie batter or vice versa, or by creating a marbled effect by swirling the two batters together.