In a high-speed blender, combine the egg whites, Greek yogurt, protein powder, oat flour, half of the banana, cinnamon, sea salt, baking powder, and vanilla extract.
Blend on high until the batter is completely smooth, then let it rest for 5 minutes to allow the oat flour to hydrate and thicken.
While the batter rests, peel the remaining half of the banana and slice it into thin, even rounds.
Heat the coconut oil in a large non-stick skillet over medium-low heat until melted and shimmering.
Arrange the banana slices in the skillet in small clusters, allowing them to sizzle for about 1 minute until they begin to caramelize.
Carefully pour the pancake batter over each cluster of banana slices to form medium-sized pancakes.
Cook for 3 to 4 minutes until the edges are set and small bubbles appear on the surface.
Gently flip the pancakes and cook for an additional 2 minutes until the other side is golden brown and the center is cooked through.
Transfer to a plate and serve immediately while the caramelized bananas are warm and soft.