In a high-speed blender, combine the rolled oats, liquid egg whites, Greek yogurt, baking powder, cinnamon, sea salt, and vanilla extract.
Blend on high for 30-45 seconds until the batter is completely smooth and the oats are fully processed into a flour-like consistency.
Slice the half banana into 0.25-inch thick rounds.
Heat a large non-stick skillet over medium heat and add the ghee, swirling to coat the pan evenly.
Place the banana slices in the skillet and sear for 1-2 minutes per side until they are golden brown and caramelized; remove them from the pan and set aside.
Wipe the skillet if necessary, then pour the pancake batter into the hot pan to form 3 or 4 medium-sized pancakes.
Cook until small bubbles form on the surface and the edges look set and matte, about 3 minutes, then flip and cook for another 2 minutes until golden.
Plate the pancakes, top with the warm caramelized banana slices, and finish with a drizzle of pure maple syrup.