Brookies (Brownie Cookies)

Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.

Beat softened butter light brown sugar 1/4 cup white sugar and 1/2 teaspoon vanilla extract together in a large bowl until creamy. Add 1 egg; beat until light and creamy about 2 minutes.

Whisk 1 1/4 cups flour 1/2 teaspoon salt and baking soda together in a bowl. Gradually stir flour mixture into butter mixture until dough is combined. Stir chocolate chips into dough. Spread dough into the bottom of the prepared baking dish to cover completely.

Stir 1 cup white sugar melted butter and 1 teaspoon vanilla extract together in a bowl; add 2 eggs and beat well. Mix cocoa powder into butter mixture until well-combined. Stir 1/2 cup flour baking powder and 1/8 teaspoon salt into cocoa mixture until batter is combined. Pour brownie batter over cookie dough and spread to cover completely.

Bake in the preheated oven until a toothpick inserted into the center of the brookies comes out clean 20 to 25 minutes. Cool completely before cutting into bars.