Mix oatmeal, protein powder, egg whites, banana (if using), cinnamon, and baking powder in a blender and blend until it's smooth.
Place a non-stick pan or waffle maker on medium heat and pour the batter onto the pan or waffle maker. Cook until bubbles form on the surface (about 2-3 minutes).
Gently flip the pancake and cook for another 2-3 minutes until golden.
To make sure it's cooked through, insert a toothpick into the center of the pancake. If it comes out clean, your pancake is ready.
Carefully transfer the cooked pancake to a plate. You can serve it as it is or with your favorite toppings like no/low-sugar syrup, fresh fruit (bananas, almonds), or a dollop of Greek yogurt.