In a blender, combine the egg whites, whole egg, Greek yogurt, protein powder, oat flour, baking powder, cinnamon, and sea salt.
Blend on high until the batter is completely smooth, then let it sit for 2 minutes to allow the oat flour to hydrate and thicken.
Heat a large non-stick skillet over medium heat and lightly coat the surface with a small fraction of the ghee.
Pour the batter into the skillet to form three or four medium pancakes.
Cook for 2-3 minutes until small bubbles form on the surface and the edges look set, then flip and cook for another 2 minutes until golden brown.
Remove the pancakes from the skillet and transfer them to a plate.
Peel and slice the banana into 1/2-inch thick rounds.
Add the remaining ghee and the maple syrup to the same skillet over medium heat.
Place the banana slices in the skillet and sauté for 1-2 minutes per side until they are soft and deeply caramelized.
Arrange the warm caramelized bananas over the pancakes and serve immediately.