In a medium mixing bowl, whisk together the egg whites, Greek yogurt, lemon juice, and vanilla extract until the mixture is smooth and aerated.
Sift the oat flour, protein powder, baking powder, cinnamon, and sea salt into the wet ingredients, stirring gently until just combined to keep the batter light.
Heat a large non-stick skillet over medium-low heat and add the ghee, swirling to coat the pan evenly.
Pour the batter into the skillet to form three medium-sized pancakes, cooking for 3-4 minutes until small bubbles appear on the surface.
Carefully flip each pancake and cook for an additional 2 minutes until they are firm and golden brown on both sides.
In a small ramekin, whisk the maple syrup with a teaspoon of warm water to create a thin, pourable glaze.
Stack the pancakes on a plate and drizzle the maple glaze over the top while they are still steaming hot.