01 - Set oven to 350°F. Line an 8x8-inch baking pan with parchment paper, ensuring edges overhang for easy removal.
02 - In a medium bowl, whisk flour, cocoa powder, baking powder, and sea salt until well blended.
03 - In a large bowl, thoroughly mix nut-milk pulp, sugar, melted coconut oil or butter, eggs, and vanilla extract until uniform.
04 - Gently fold the dry ingredients into the wet mixture just until blended. Avoid overmixing to maintain a tender crumb.
05 - Stir in chocolate chips and optional nuts, distributing evenly through the batter.
06 - Transfer the batter to the prepared pan and smooth the surface with a spatula.
07 - Place the pan in the oven and bake for 28 to 32 minutes, until a toothpick inserted in the center yields a few moist crumbs.
08 - Allow brownies to cool fully in the pan. Once cooled, lift by parchment edges and portion into squares.