01 - Preheat oven to 350°F. Line an 8x8 inch baking pan with parchment paper, allowing overhang on sides for easy removal.
02 - In a medium bowl, whisk together flour, cocoa powder, brown sugar, baking powder, and salt until well combined.
03 - Pour melted coconut oil or vegan butter into the dry mixture. Add plant milk and vanilla extract. Stir until just combined, being careful not to overmix. Fold in dark chocolate chips.
04 - Transfer brownie batter to the prepared pan. Using a spatula, spread evenly across the bottom, ensuring full coverage.
05 - In a separate bowl, beat softened vegan butter with brown sugar and granulated sugar until light and fluffy, approximately 2 minutes.
06 - Add plant milk and vanilla to the creamed mixture. Mix well. Gradually incorporate flour, baking soda, and salt, stirring until just combined. Gently fold in chocolate chips.
07 - Carefully spread cookie dough in an even layer over the brownie batter. Lightly wet your hands or spatula with water to prevent sticking and smooth the surface.
08 - Bake for 30-35 minutes until the top is golden brown. A toothpick inserted in the center should emerge with a few moist crumbs, not wet batter.
09 - Allow the brookies to cool completely in the pan, approximately 1 hour. Lift out using parchment paper handles and slice into 12 equal squares.