Preheat the oven to 180°C (356°F).
In a bowl, mix almond flour, protein powder, cocoa powder, and baking powder.
Add egg, unsweetened almond milk, olive oil, and erythritol, and knead to form a dough.
Chop the dark chocolate and mix it into the dough.
Shape the dough into cookies and place them on a pan.
Bake in the oven at 180°C (356°F) for 12-15 minutes.
Transfer to a cooling rack and let them cool.