Creating Double Chocolate Brookies is achievable with these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish or line it with parchment paper for easy removal.

2. Prepare Brownie Layer:
– In a large mixing bowl, whisk together the melted butter and granulated sugar until smooth.
– Add the eggs one at a time, mixing well after each addition, followed by the vanilla extract.
– In another bowl, sift together the flour, cocoa powder, baking powder, and salt.
– Gradually add the dry ingredients to the wet mixture, stirring until just combined.

3. Pour Brownie Batter: Evenly spread the brownie mixture into the bottom of your prepared baking dish.

4. Prepare Cookie Layer:
– In a separate bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.
– Mix in the egg and vanilla extract until well combined.
– In another bowl, whisk together the flour, baking soda, and salt.
– Gradually add the dry ingredients to the wet mixture, mixing until just incorporated. Fold in the chocolate chips.

5. Spread Cookie Layer: Drop spoonfuls of the cookie dough evenly over the brownie mixture. Use a spatula to spread it gently, leaving some brownie visible.

6. Bake: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out with moist crumbs.

7. Cool: Once baked, remove the dish from the oven. Allow the brookies to cool in the pan for 10-15 minutes before slicing into squares.

8. Serve and Enjoy: Your Double Chocolate Brookies are now ready to be enjoyed!