In a high-speed blender, combine the rolled oats, liquid egg whites, whole egg, half of the Greek yogurt, cinnamon, vanilla, baking powder, and sea salt.
Blend on high for 45 seconds until the batter is completely smooth and the oats have reached a fine flour consistency.
Heat a large non-stick skillet over medium-low heat and lightly coat with a tiny bit of oil or cooking spray.
Slice the half banana into thin rounds and toss them gently with the maple syrup in a small bowl to coat.
Pour the batter into the skillet to form three small pancakes, then quickly press the banana slices into the wet top of each pancake.
Cook for 3 minutes until bubbles form on the surface, then flip to caramelize the bananas for 2 more minutes until golden brown.
Plate the pancakes with the caramelized banana side facing up and top with the remaining dollop of Greek yogurt.