01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, ensuring edges are covered.
02 - In a medium mixing bowl, whisk together flour, cocoa powder, baking powder, and sea salt until evenly combined.
03 - In a large separate bowl, thoroughly mix nut-milk pulp, sugar, melted coconut oil or butter, eggs, and vanilla extract until the mixture is smooth and cohesive.
04 - Gradually fold the dry ingredient mixture into the wet mixture, mixing gently to combine. Avoid overmixing to maintain a tender texture.
05 - Stir in dark chocolate chips and chopped nuts if using, distributing evenly throughout the batter.
06 - Pour the prepared batter into the lined baking pan. Smooth the surface with a spatula for even baking.
07 - Bake at 350°F for 28 to 32 minutes, or until a toothpick inserted into the center emerges with a few moist crumbs.
08 - Allow brownies to cool fully in the pan. Once completely cooled, lift out using the parchment overhang and slice into squares.