In a medium bowl, whisk together the ricotta cheese, egg whites, whole egg, Greek yogurt, and vanilla extract until the mixture is smooth and well combined.
Add the oat flour, baking powder, sea salt, and lemon zest to the wet ingredients, stirring gently with a spatula until just incorporated.
Carefully fold the fresh blueberries into the batter, taking care not to crush them so the batter remains clean.
Heat a large non-stick skillet or griddle over medium-low heat and add the ghee, swirling to coat the surface evenly.
Using a 1/4 cup measure, scoop the batter onto the hot skillet for each pancake, leaving space between them to flip.
Cook for 3 to 4 minutes until small bubbles appear on the surface and the edges look set and matte.
Carefully flip each pancake and cook for an additional 2 to 3 minutes until they are golden brown and firm to the touch.
Transfer the pancakes to a plate and serve immediately while warm.