01 -  Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving an overhang for easy removal. 
 02 -  In a medium bowl, whisk together flour, cocoa powder, baking powder, and sea salt until well combined. 
 03 -  In a large bowl, blend nut-milk pulp, sugar, melted coconut oil or butter, eggs, and vanilla extract until smooth. 
 04 -  Gradually fold dry ingredients into wet mixture using a spatula. Mix only until no flour streaks remain; avoid overmixing. 
 05 -  Stir in chocolate chips and optional chopped nuts until evenly distributed. 
 06 -  Pour batter into prepared pan and level the surface with a spatula. 
 07 -  Bake for 28 to 32 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. 
 08 -  Allow brownies to cool completely in the pan before removing and slicing into squares.