01 - In a large bowl, whisk together ricotta, egg yolks, milk, melted butter, lemon zest, lemon juice, and vanilla extract until smooth.
02 - In a separate bowl, combine flour, sugar, baking powder, baking soda, and salt.
03 - Gently fold the dry ingredients into the wet mixture until just combined; do not overmix.
04 - In a clean bowl, beat the egg whites with a hand mixer or whisk until soft peaks form.
05 - Gently fold the beaten egg whites into the pancake batter, preserving as much air as possible.
06 - Heat a nonstick skillet or griddle over medium heat and lightly grease with butter or oil.
07 - Pour 1/4 cup of batter per pancake onto the skillet. Cook for 2-3 minutes, or until bubbles form on the surface and edges look set. Flip and cook for another 1-2 minutes, until golden and cooked through.
08 - Serve pancakes warm, stacked, and topped with fresh berries, maple syrup, and a dusting of powdered sugar if desired.