01 - Preheat oven to 350°F. Line an 8 x 8-inch baking pan with parchment paper for easy removal.
02 - Whisk flour, cocoa powder, baking powder, and salt together in a medium mixing bowl until evenly blended.
03 - In a large bowl, mix nut-milk pulp, sugar, melted coconut oil or butter, eggs, and vanilla extract until smooth.
04 - Gradually fold the dry ingredients into the wet mixture, stirring gently until just combined without overmixing.
05 - Stir in chocolate chips and nuts, if using, ensuring even distribution throughout the batter.
06 - Scrape batter into the prepared pan and smooth the surface with a spatula.
07 - Bake for 28 to 32 minutes or until a toothpick inserted in the center yields a few moist crumbs.
08 - Allow brownies to cool completely in the pan before slicing into squares and serving.