Creating fudgy chewy brookies is easy when you follow these steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Prepare an 8×8 inch baking pan by greasing it or lining it with parchment paper.
2. Make the Brownie Layer:
– In a medium saucepan, melt the butter over low heat.
– Stir in the granulated sugar, eggs, and vanilla extract until combined.
– Add the cocoa powder, flour, salt, and baking powder. Mix until fully incorporated, then pour into the prepared baking pan.
3. Prepare the Cookie Layer:
– In a large bowl, cream together the softened butter, granulated sugar, and brown sugar.
– Mix in the egg and vanilla until smooth.
– In a separate bowl, combine the flour, baking soda, and salt. Gradually add it to the wet ingredients, mixing just until combined.
– Fold in the chocolate chips.
4. Combine Layers: Drop spoonfuls of the cookie dough on top of the brownie batter. Use a spatula to gently swirl the layers together, creating a marbled effect.
5. Bake: Place the pan in the preheated oven and bake for 25-30 minutes or until a toothpick inserted into the brownie portion comes out with a few moist crumbs.
6. Cool: Remove from the oven and allow to cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.
7. Slice and Serve: Once cooled, slice them into squares and enjoy!