Grind the oatmeal finely.
In a bowl, mix the ground oatmeal, protein powder, cocoa powder, baking powder, and salt.
In another bowl, combine eggs, milk (or plant-based milk), olive oil, and stevia, and stir well.
Mix the dry ingredients and wet ingredients together to form a dough.
Pour the dough into a ceramic dish or mug.
Microwave for 2 minutes at 700W.