01 - Preheat the oven to 350°F. Grease an 8x8-inch baking pan or line it with parchment paper.
02 - Whisk together almond flour, cocoa powder, baking powder, and salt in a medium bowl.
03 - In a large bowl, whisk melted butter, granulated sugar, brown sugar, eggs, and vanilla extract until smooth and glossy.
04 - Gently fold the dry mixture into the wet ingredients until just combined.
05 - Fold in dark chocolate chips and nuts, if using, until evenly distributed.
06 - Pour the batter into the prepared pan and spread evenly.
07 - Bake for 23 to 26 minutes, or until the center is set and a toothpick inserted comes out with moist crumbs.
08 - Allow brownies to cool completely in the pan before slicing into 16 squares.