In a large mixing bowl, whisk together the egg whites, non-fat Greek yogurt, and vanilla extract until the mixture is smooth and slightly frothy.
Add the oat flour, baking powder, ground cinnamon, and sea salt to the wet ingredients, stirring until just combined to maintain a light texture.
Peel the banana and slice it into 1/4-inch thick rounds.
Heat a large non-stick skillet over medium heat and add the ghee, swirling the pan to ensure the surface is evenly coated.
Place the banana slices in the skillet in small clusters and cook for 1 minute until they begin to sizzle and turn golden.
Pour the pancake batter directly over the banana clusters, creating 3 to 4 medium-sized pancakes.
Cook for 3-4 minutes until small bubbles appear on the surface and the edges look set, then carefully flip.
Continue cooking for another 2 minutes until the pancakes are golden brown and the bananas are beautifully caramelized.