Add oat flour, chocolate protein powder, cocoa powder, baking powder and salt. Stir until evenly combined.
Add maple syrup, milk and half of the chocolate chunks.
Stir until a smooth batter forms.
Sprinkle the remaining chocolate chunks over the top.
Microwave on High for 60 seconds.
Continue cooking in 10-second intervals until puffed and set on top but still slightly soft in the center. Total cooking time is usually 80–90 seconds.