Melt dark chocolate and butter using a double boiler.
Whip eggs and erythritol together.
Add the melted chocolate-butter mixture to the eggs and mix.
Sift almond flour, cocoa powder, and baking powder into the batter and mix.
Mix in chocolate chips.
Place the dough on a baking pan and shape it.
Bake in a preheated oven at 180°C for 12 minutes.