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 large bowl, whisk together the mashed avocado, eggs, melted coconut oil, and vanilla extract until the mixture is smooth.
03 - Add the granulated sugar and mix until fully combined with the wet ingredients.
04 - Sift in cocoa powder, almond flour, baking soda, and salt. Stir gently until just combined, taking care not to overmix.
05 - Fold in the dark chocolate chips and nuts, if using.
06 - Pour the batter into the prepared pan and smooth the surface with a spatula.
07 - Bake for 22 to 25 minutes, until a toothpick inserted in the center emerges with a few moist crumbs.
08 - Remove from oven and sprinkle generously with flaky sea salt while warm.
09 - Allow brownies to cool completely in the pan before removing and slicing into squares.