01 -
Gather all ingredients and preheat oven to 175°C (350°F). Grease a 23x33cm (9x13-inch) baking dish.
02 -
In a bowl, cream 1/2 cup butter, 1/2 cup light brown sugar, 1/4 cup white sugar, and 1/2 teaspoon vanilla until creamy. Add 1 egg and beat until light and creamy, about 2 minutes. In another bowl, whisk 1 1/4 cups flour, 1/2 teaspoon salt, and 1/2 teaspoon baking soda. Gradually mix the dry ingredients into the wet ingredients until dough is combined. Stir in chocolate chips. Spread dough evenly into the greased baking dish and set aside.
03 -
In a bowl, mix 1 cup sugar, 1/2 cup melted butter, and 1 teaspoon vanilla until combined. Add 2 eggs and beat well. Gradually mix in cocoa powder until smooth. Stir in 1/2 cup flour, 1/4 teaspoon baking powder, and 1/8 teaspoon salt until batter is combined. Pour over the cookie layer and spread to cover completely.
04 -
Bake in the preheated oven for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean. Allow to cool completely before cutting into 20 bars.