Coarsely chop the almonds.
In a bowl, mix butter and erythritol with a whisk.
Add the egg and mix, then add almond powder, baking powder, and salt to make the dough.
Add the coarsely chopped almonds and mix well.
Shape the dough into balls and place them on a pan.
Bake in a preheated oven at 180°C for 15 minutes.