Preheat the oven to 350 F. Place a piece of parchment paper on a baking pan.
In a large bowl, mix together the almond flour, coconut flakes, melted butter, and vanilla extract.
Beat the egg whites with the erythritol until stiff peaks form.
In small parts, add the whites to the other bowl and carefully, with a spatula, mix everything together.
Using a tablespoon, place the batter onto the baking pan and form the cookies. Depending on the cookie size and thickness, you should bake for around 15-20 minutes. When they turn brownish – they’re ready.