Preheat oven to 350°F and line a 9×9 pan with parchment paper.

In a bowl, whisk together melted butter and sugar.

Add eggs and vanilla and whisk until smooth.

Stir in flour, cocoa powder, baking powder, and salt until just combined.

Add the chocolate chips and fold in. More chocolate is always better.

Spread the brownie batter evenly into the prepared pan.

Make the Cookie Layer

In another bowl, cream together butter and sugars until light and fluffy.

Beat in egg and vanilla.

Stir in flour, baking soda, and salt until just combined.

Fold in chocolate chips.

Drop spoonfuls of cookie dough over the brownie batter. Don’t worry about covering it perfectly—those rustic gaps are charming and intentional and definitely not because we’re tired.

Bake at 350°F for 28–33 minutes, until the top is golden and a toothpick comes out with moist crumbs (not wet batter).

Let cool completely before slicing… or mostly cool if your household has no patience.