Preheat the oven to 180°C.
Mix almond flour and erythritol in a bowl.
Add the egg and olive oil, then knead into a dough.
Shape the dough into bite-sized balls.
Place a little dark chocolate on top of each cookie.
Line a baking tray with parchment paper and place the dough balls on top.
Bake in the oven at 180°C for 13 minutes.