Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13-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.
You can use store bought chocolate chip cookie dough instead of making the cookies.
Please note differences in serving size amounts when following the magazine version of this recipe.
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