Preheat the oven to 180°C (356°F).
Mix the butter and erythritol in a bowl.
Add the egg and mix well.
Sift in the almond flour, cocoa powder, and baking powder, then mix until combined.
Add the dark chocolate chips and shape the dough into balls.
Place the dough balls on a pan and bake for 15 minutes.
Let the cookies cool to finish.