01 - Whisk together ricotta, egg yolks, milk, lemon zest, lemon juice, vanilla extract, and melted butter in a large bowl until smooth and well combined.
02 - Sift flour, baking powder, salt, and sugar into a separate bowl to ensure even distribution and eliminate lumps.
03 - Add dry ingredients to the ricotta mixture and fold gently until just combined, taking care not to overmix and develop gluten.
04 - Beat egg whites to stiff peaks in a clean bowl, then fold into batter in two additions to preserve maximum air volume for lift.
05 - Heat a nonstick skillet or griddle over medium-low heat and brush lightly with butter to prevent sticking.
06 - Pour 1/4 cup batter per pancake onto skillet. Cook 2-3 minutes until bubbles form and edges set, then flip and cook 1-2 minutes more until golden and cooked through.
07 - Repeat with remaining batter, adding butter to skillet as needed between batches to maintain nonstick surface.
08 - Serve pancakes warm topped with fresh berries, optional maple syrup or honey, and powdered sugar if desired.