In a large mixing bowl, whisk together the Greek yogurt, liquid egg whites, and vanilla protein powder until smooth.
Fold in the oat flour, baking powder, 0.5 tsp of the ground cinnamon, and sea salt, stirring until just combined.
Heat a large non-stick skillet over medium-low heat and lightly coat with a tiny bit of ghee if necessary.
Pour the batter into the skillet to form 3-4 medium pancakes, cooking for 3-4 minutes until bubbles form on the surface, then flip and cook for another 2 minutes until golden brown.
While the pancakes cook, core and dice the apple into small bite-sized pieces.
In a separate small skillet, melt the remaining ghee over medium heat and add the diced apples, the remaining 0.5 tsp of cinnamon, and the maple syrup.
Sauté the apples for 5-7 minutes, stirring frequently, until they are tender and the syrup has thickened into a light glaze.
Stack the pancakes on a plate and top generously with the warm caramelized apples and any remaining pan glaze.