Grind the oats finely into a powder.
In a bowl, mix the oat flour, protein powder, cocoa powder, and baking powder together.
Add the egg, milk, unsweetened yogurt, and honey, and mix well.
Pour the batter into an appropriate pan or muffin mold.
Sprinkle chocolate chips on top.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.