In a large mixing bowl, whisk together the oat flour, vanilla protein powder, baking powder, and sea salt until well combined.
Add the Greek yogurt, egg whites, and unsweetened almond milk to the dry mixture, stirring gently until a thick batter forms.
Core and thinly slice the medium apple into uniform wedges.
Heat a small non-stick skillet over medium heat and add the ghee; once melted, toss in the apple slices, cinnamon, and maple syrup.
Sauté the apples for 5-7 minutes, stirring occasionally, until they are tender and the juices have thickened into a light glaze.
While the apples cook, heat a separate large non-stick griddle or pan over medium-low heat and lightly coat with cooking spray.
Ladle the pancake batter onto the griddle to form four pancakes, cooking for 3-4 minutes until bubbles appear on the surface and the edges look set.
Flip the pancakes carefully and cook for another 2 minutes until both sides are golden brown and cooked through.
Plate the pancakes in a tall stack and spoon the warm caramelized apples and their glaze over the top before serving.