Melt dark chocolate and butter using a double boiler.
Whip the eggs and erythritol together.
Mix the melted chocolate and butter mixture into the eggs.
Sift in almond flour, baking powder, and salt, then mix well.
Scoop the dough into round shapes and place on a baking sheet.
Bake in a preheated oven at 180°C for 10-12 minutes.
Let cool and they are ready to serve.