Whisk Dry Ingredients: In a medium-sized bowl, whisk together the flour, baking powder, and sugar. Set aside.
Whisk Wet Ingredients: In a large bowl, add milk, egg yolks, maple syrup, vanilla extract, lemon juice, and ricotta. Whisk, set aside.
Whip Egg Whites: Add egg whites to a medium sized bowl and using an electric hand mixer, whisk egg whites until soft peaks form. Approximately 4-5 minutes on medium.
Make Batter: Add the dry ingredients to the wet and mix until just combined. Don't over mix. Add whipped egg whites and gently fold into the batter, turning it with a spatula.
Cook: Heat a griddle or large skillet over medium-high heat. Melt a tiny bit of butter in the pan, just enough to coat the surface, or use a misto to spray a bit of oil.Use a ladle to pour batter onto the hot griddle. Add blueberries to the batter of each pancake. Cook the pancakes for about 3 or 4 minutes, until the undersides are golden and you see a few bubbles popping through the pancakes. Flip the pancakes and cook another 2 to 3 minutes, until they are golden. Repeat with the remaining pancakes. Serve: Serve pancakes with a bit of lemon zest, more blueberries, and maple syrup.