01 -
Preheat your oven to 350°F (175°C) and prepare a 9x9-inch baking tin with grease or parchment paper.
02 -
For the brownie layer, mix melted butter, sugar, and vanilla in a bowl. Stir in the eggs until smooth. Add flour, cocoa powder, and salt, and mix until combined. Spread evenly in the prepared pan.
03 -
For the cookie layer, beat softened butter, granulated sugar, and brown sugar until creamy. Add egg and vanilla, and mix. Stir in flour, baking soda, and salt, then fold in chocolate chips.
04 -
Drop spoonfuls of the cookie dough over the brownie layer and spread evenly.
05 -
Bake for 25-30 minutes, until the top is golden, and a toothpick inserted comes out slightly crumby.
06 -
Let the bars cool completely before slicing.