4Prepare the cookie layer: Mix flour, baking soda, and salt. Set aside. Combine melted butter, brown and granulated sugar, egg, and vanilla. Whisk until smooth and fluffy for about 2-3 minutes. Add dry ingredients and chocolate chips. Mix until just combined.
5Prepare the cookie layer: Mix flour, baking soda, and salt. Set aside. Combine melted butter, brown and granulated sugar, egg, and vanilla. Whisk until smooth and fluffy for about 2-3 minutes. Add dry ingredients and chocolate chips. Mix until just combined.
6Prepare the cookie layer: Mix flour, baking soda, and salt. Set aside. Combine melted butter, brown and granulated sugar, egg, and vanilla. Whisk until smooth and fluffy for about 2-3 minutes. Add dry ingredients and chocolate chips. Mix until just combined.
7Prepare the brownie layer: Melt butter in a saucepan over medium-low heat. Stir every 10 seconds until foamy (6-8 minutes). Continue until milk solids turn golden brown and smell nutty. Transfer to a heatproof bowl. Add cocoa powder, oil, vanilla, and chopped chocolate; mix until smooth. In a separate bowl Whisk 3 eggs and light brown sugar for 5-6 minutes until dissolved. Add powdered sugar; mix 1-2 minutes until combined. Add cooled browned butter mixture; mix until smooth. Add flour and chocolate chips; mix until well combined.
8Prepare the brownie layer: Melt butter in a saucepan over medium-low heat. Stir every 10 seconds until foamy (6-8 minutes). Continue until milk solids turn golden brown and smell nutty. Transfer to a heatproof bowl. Add cocoa powder, oil, vanilla, and chopped chocolate; mix until smooth. In a separate bowl Whisk 3 eggs and light brown sugar for 5-6 minutes until dissolved. Add powdered sugar; mix 1-2 minutes until combined. Add cooled browned butter mixture; mix until smooth. Add flour and chocolate chips; mix until well combined.
9Prepare the brownie layer: Melt butter in a saucepan over medium-low heat. Stir every 10 seconds until foamy (6-8 minutes). Continue until milk solids turn golden brown and smell nutty. Transfer to a heatproof bowl. Add cocoa powder, oil, vanilla, and chopped chocolate; mix until smooth. In a separate bowl Whisk 3 eggs and light brown sugar for 5-6 minutes until dissolved. Add powdered sugar; mix 1-2 minutes until combined. Add cooled browned butter mixture; mix until smooth. Add flour and chocolate chips; mix until well combined.
10Layer the cookie and brownie batters in the prepared pan.
11Layer the cookie and brownie batters in the prepared pan.
12Layer the cookie and brownie batters in the prepared pan.
13Bake for 50-55 minutes or until the edges are golden and the center is a little jiggly.
14Bake for 50-55 minutes or until the edges are golden and the center is a little jiggly.
15Bake for 50-55 minutes or until the edges are golden and the center is a little jiggly.
16Let cool completely before cutting into brookies.
17Let cool completely before cutting into brookies.
18Let cool completely before cutting into brookies.