Core and thinly slice the apple into uniform wedges.
Heat a small skillet over medium heat, add the ghee, and once melted, toss in the apple slices and cinnamon.
Sauté the apples for 5-7 minutes until they are soft, golden, and slightly caramelized, then set aside.
In a medium mixing bowl, whisk together the Greek yogurt, liquid egg whites, and vanilla extract until the mixture is completely smooth.
Gently fold in the oat flour, baking powder, and sea salt, being careful not to over-mix the batter.
Preheat a non-stick griddle or large pan over medium-low heat and lightly coat with a touch of oil or cooking spray.
Pour the batter onto the griddle to form three or four pancakes; cook until small bubbles appear on the surface and the edges look set.
Carefully flip the pancakes and cook for another 2 minutes until both sides are golden brown and the center is cooked through.
Transfer the pancakes to a plate and top immediately with the warm caramelized cinnamon apples.