Place the rolled oats in a high-speed blender and pulse until they reach a fine, flour-like consistency.
Add the egg whites, Greek yogurt, half of the banana, cinnamon, sea salt, vanilla extract, and baking powder to the blender.
Blend on high until the batter is completely smooth and aerated.
Slice the remaining half of the banana into thin, even rounds.
Heat the ghee in a large non-stick skillet over medium-low heat until melted and shimmering.
Pour the batter into the skillet to form three or four medium-sized pancakes.
Carefully place the banana slices onto the wet surface of each pancake, pressing them in slightly.
Cook for 3 to 4 minutes until bubbles form on the surface, then flip and cook for another 2 minutes until the bananas are deeply caramelized.
Transfer to a plate and enjoy immediately while the edges are crisp.