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