Mash and mix the egg and banana evenly in a bowl.
Add cocoa powder and oatmeal, and mix well.
Lightly grease the pan with olive oil and preheat over medium-low heat.
Pour the batter into the pan, cover with a lid, and bake for about 5 minutes.
Flip and cook for another 2-3 minutes.
Transfer to a plate, cool, and enjoy.