01 - Preheat the oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing some overhang for easy removal.
02 - Whisk together the almond flour, cocoa powder, fine sea salt, and baking powder 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 - Add the dry mixture to the wet ingredients and mix gently until just combined. Avoid overmixing.
05 - Fold in the chopped chocolate or chocolate chips evenly through the batter.
06 - Pour the batter into the prepared pan and smooth the surface with a spatula.
07 - Evenly sprinkle the flaky sea salt over the batter surface.
08 - Bake for 22 to 25 minutes, or until the center is set but still moist, and a toothpick inserted comes out with a few moist crumbs.
09 - Allow the brownies to cool completely in the pan on a wire rack before lifting out using the parchment overhang and slicing.