In a small saucepan over medium heat, combine the mixed berries and lemon juice, simmering until the fruit breaks down into a thick, glossy sauce.
In a large mixing bowl, whisk together the oat flour, baking powder, and a pinch of sea salt until well combined.
In a separate bowl, blend the fat-free ricotta, egg whites, Greek yogurt, lemon zest, and vanilla extract until the mixture is smooth and aerated.
Gently fold the wet ingredients into the dry ingredients, being careful not to overmix to maintain a light, airy texture.
Heat a non-stick skillet over medium-low heat and lightly coat with coconut oil.
Pour 1/4 cup of batter per pancake onto the skillet, cooking for 3-4 minutes until small bubbles form on the surface.
Flip carefully and cook for another 2 minutes until the pancakes are golden brown and firm to the touch.
Plate the warm pancakes and ladle the steaming berry compote over the top before serving.