01 -
Preheat oven to 175°C (350°F). Grease a 23×23 cm (9×9-inch) square baking pan with butter or line with parchment paper for easy removal.
02 -
In a medium bowl, whisk together flour, baking soda, and salt. In a separate bowl, cream butter with granulated and brown sugars until light and fluffy. Add egg and vanilla extract, mixing until fully incorporated. Gradually fold in the dry ingredients until just combined. Stir in chocolate chips if using.
03 -
In a separate bowl, whisk together melted butter and granulated sugar. Add eggs and vanilla extract, mixing until smooth. Sift in flour, cocoa powder, and salt, stirring until well combined. Fold in chocolate chips if desired.
04 -
Spread cookie dough evenly across the bottom of the prepared baking pan, creating a smooth and even layer. Pour brownie batter over the cookie dough, gently spreading with a spatula to ensure complete coverage.
05 -
Bake in preheated oven for 30-35 minutes, until a toothpick inserted into the center comes out mostly clean with a few crumbs. Cookie layer should be golden with slightly crisp edges while brownie layer remains fudgy.
06 -
Allow brookies to cool in the pan for 10-15 minutes before transferring to a cooling rack to cool completely. Once cooled, cut into squares or rectangles.