Preheat the oven to 180°C (356°F).
In a bowl, cream together the butter and erythritol.
Add the eggs and mix well.
Add almond flour, baking powder, and salt, and mix.
Add chopped dark chocolate and knead the dough.
Shape the dough into balls and place them on a baking pan.
Bake at 180°C for 12 minutes.