Mix oat flour, protein powder, dietary fiber, almond flour, baking powder, and salt in a bowl.
Add egg, unsweetened almond milk, olive oil, and honey. Mix thoroughly.
Fold in dark chocolate or nuts into the batter.
Shape the dough into cookies and place them on a baking sheet.
Bake in a preheated oven at 180°C for 15 minutes.
Cool to finish.