Mix oat flour and protein powder in a bowl.
Add cocoa powder, baking powder, and salt.
Add the egg and milk, then mix well to form a batter.
Preheat a pan over medium-low heat and lightly grease with olive oil.
Pour an appropriate amount of batter onto the pan and spread into a round shape.
When one side is cooked, flip and cook both sides until golden brown.
Top the pancakes with yogurt, dark chocolate pieces, and banana slices.