Add the rolled oats, ripe banana, whole eggs, liquid egg whites, baking powder, a pinch of sea salt, a pinch of ground cinnamon, protein powder, and ground flaxseed meal to a blender.
Blend on medium-low until the batter is smooth and well combined.
Preheat a nonstick skillet or griddle over medium-high heat and lightly grease it with cooking spray or a little coconut oil.
Pour about 1/4 cup of batter per pancake onto the hot surface. If using, sprinkle a few blueberries or chocolate chips onto each pancake now.
Cook until the edges appear set and the bottom is golden, about 2–3 minutes, then flip and cook the other side 1–2 minutes until golden brown and cooked through.
Serve the pancakes hot with your choice of toppings.