01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper.
02 - In a medium mixing bowl, whisk together flour, cocoa powder, baking powder, and sea salt until evenly blended.
03 - In a large bowl, combine nut-milk pulp, sugar, melted coconut oil or unsalted butter, eggs, and vanilla extract. Stir until smooth and fully incorporated.
04 - Gradually fold dry ingredient mixture into the wet mixture, mixing only until just combined. Avoid overmixing.
05 - Gently stir in chocolate chips or chopped chocolate and optional chopped nuts, ensuring an even distribution.
06 - Pour batter into prepared pan, smoothing the surface with a spatula.
07 - Bake for 28 to 32 minutes, or until a toothpick inserted into the center emerges with a few moist crumbs.
08 - Allow brownies to cool completely in the pan before cutting into squares.