01 - Preheat your oven to 350°F. Line an 8x8 inch baking pan with parchment paper, allowing some overhang for easy removal.
02 - In a medium bowl, whisk together flour, cocoa powder, brown sugar, baking powder, and salt until well combined. Add melted coconut oil (or vegan butter), plant milk, and vanilla extract. Mix until just combined, being careful not to overmix. Fold in 1/2 cup vegan dark chocolate chips.
03 - Spread the brownie batter evenly across the bottom of the prepared pan, using a spatula to create a smooth, uniform layer.
04 - In a separate bowl, cream together softened vegan butter, brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes. Add plant milk and vanilla extract; mix well to incorporate.
05 - Add flour, baking soda, and salt to the wet mixture. Stir until just combined, avoiding overmixing. Fold in 3/4 cup vegan chocolate chips until evenly distributed.
06 - Carefully spread the cookie dough in an even layer over the brownie batter. Lightly wet your spatula or hands with water to prevent sticking and help achieve an even distribution.
07 - Bake for 30-35 minutes, or until the top is golden brown and a toothpick inserted in the center comes out with a few moist crumbs attached. The edges should be set but the center may still appear slightly soft.
08 - Allow the brookies to cool completely in the pan before slicing into 12 squares. This step is crucial for clean cuts and proper texture development.