This recipe combines golden cookies and chewy brownies in a tasty double layer, ensuring that everyone is happy, whether they prefer cookies or brownies.
Preheat the oven to 350°. Line a 9x13-inch baking dish with parchment paper.
Cookie Layer
Beat butter, brown sugar, white sugar, and vanilla in a large bowl until creamy. Add egg; beat until light and creamy, about 2 minutes.
In a medium bowl whisk together flour, salt, and baking soda. Slowly stir flour mixture into butter mixture until dough is combined. Stir chocolate chips into the dough.
Spread dough evenly into the prepared baking dish. It is easiest to butter your hands or a silicone spatula and press it flat in the bottom of the baking pan. Set aside.
Brownie Layer
Beat together sugar, butter, and vanilla in a bowl; add eggs and beat well. Mix in cocoa powder until well-combined. Stir in flour, baking powder, and salt until batter is combined.
Pour over the cookie layer and spread to cover completely.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 30 to 35 minutes.