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 the all-purpose flour, cocoa powder, brown sugar, baking powder, and salt until well combined.
03 - Add melted coconut oil or vegan butter, plant milk, and vanilla extract to the dry mixture. Mix until just combined. Fold in the dark chocolate chips.
04 - Press the brownie batter evenly into the bottom of the prepared baking pan using a spatula or offset spatula.
05 - In a separate bowl, cream together the softened vegan butter, brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes.
06 - Add plant milk and vanilla extract to the creamed mixture, mixing well. Gradually add flour, baking soda, and salt, stirring until just combined. Fold in the chocolate chips.
07 - Carefully spread the cookie dough in an even layer over the brownie batter. Lightly wet your hands or spatula with water to prevent sticking and help distribute evenly.
08 - 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.
09 - Cool completely in the pan for at least 1 hour. Using the parchment overhang, lift out and slice into 12 squares.