Preheat the oven to 350 degrees Fahrenheit. Lightly grease an 8x8 inch baking pan or line it with parchment paper.
In a small bowl, whisk together eggs and sugar.
Add melted butter and vanilla to egg mixture and stir to combine.
In a medium bowl, mix together all the dry ingredients: almond flour, cacao powder, baking powder, and salt.
Add the wet ingredients to the dry ingredients and mix until just combined (you don't want to over mix it).
Transfer the batter to your baking pan.
Bake for 25 minutes, until the edges are set and the middle looks slightly under-baked. The middle will continue to cook while it cools so you want to take it out of the oven before it is completely cooked through.
Cool completely and then cut into squares.