Grind the oatmeal finely in a blender.
In a bowl, mix oatmeal, protein powder, and baking powder.
Add egg and milk to make a batter.
Gently fold blueberries into the batter.
Heat a pan with oil and spread the batter thinly over medium-low heat.
Cover with a lid and cook until golden on both sides.
Place the finished cake on a plate and top with blueberries.