01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - In a medium bowl, whisk together flour, cocoa powder, baking powder, and sea salt until evenly combined.
03 - In a large bowl, blend nut-milk pulp, sugar, melted coconut oil or butter, eggs, and vanilla extract. Stir until homogeneous and smooth.
04 - Gradually fold dry ingredients into the wet mixture, mixing until just combined to avoid overmixing.
05 - Stir in chocolate chips and chopped nuts, if using, ensuring even distribution throughout the batter.
06 - Transfer batter to the prepared pan, smoothing the surface gently. Bake for 28 to 32 minutes, or until a toothpick inserted in the center yields moist crumbs.
07 - Allow brownies to cool completely in the pan before slicing into 12 squares.