Place the rolled oats in a high-speed blender and pulse until they reach a fine, flour-like consistency.
In a medium bowl, whisk together the oat flour, vanilla protein powder, baking powder, cinnamon, and sea salt.
Add the liquid egg whites, non-fat Greek yogurt, and vanilla extract to the dry ingredients, stirring until the batter is just combined.
Slice the half banana into thin, even rounds.
Heat a non-stick skillet over medium-low heat and melt the ghee, swirling to coat the surface evenly.
Place the banana slices in the pan and sear for about 1 minute until they begin to caramelize and turn a deep golden brown.
Pour the pancake batter directly over the banana slices to form three or four small pancakes.
Cook for 2-3 minutes until bubbles form on the surface and the edges look set, then flip carefully.
Cook for another 1-2 minutes until the pancakes are firm and cooked through.
Transfer to a plate with the caramelized banana side facing up and serve immediately while warm.