01 - Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper, allowing an overhang for easy removal.
02 - In a medium bowl, whisk together almond flour, cocoa powder, baking powder, and salt until evenly blended.
03 - In a large bowl, whisk melted butter, granulated sugar, and brown sugar until smooth. Add eggs and vanilla extract, whisking until fully combined.
04 - Add the dry ingredients to the wet mixture and gently stir until just combined. Fold in chocolate chips and nuts if using.
05 - Pour batter into the prepared pan and smooth the surface with a spatula.
06 - Bake for 23 to 25 minutes, or until a toothpick inserted into the center comes out with moist crumbs but no wet batter.
07 - Allow brownies to cool completely in the pan on a wire rack. Lift out using parchment overhang, slice into 12 portions, and serve.