Preheat the oven to 180°C (356°F).
In a bowl, mix oats, protein powder, baking powder, salt, eggs, banana, and peanut butter.
Fold in dark chocolate evenly into the dough.
Line a baking tray with parchment paper and shape the dough into rounds on it.
Bake in the oven at 180°C (356°F) for 12-15 minutes.
Let cool before eating.