01 - Whisk together the flour, sugar, baking powder, baking soda, and salt in a large bowl.
02 - In a separate bowl, blend the ricotta, egg yolks, milk, melted butter, lemon zest, lemon juice, and vanilla until smooth.
03 - Gently fold the wet mixture into the dry ingredients until just combined, avoiding overmixing.
04 - Whisk egg whites in a clean bowl until stiff peaks form.
05 - Carefully fold the beaten egg whites into the batter in two additions to retain airiness.
06 - Heat a nonstick skillet or griddle over medium heat and lightly grease with butter or oil.
07 - Pour approximately 1/4 cup batter per pancake onto the skillet. Cook until bubbles appear and edges set, about 2 to 3 minutes. Flip and cook an additional 1 to 2 minutes until golden.
08 - Repeat cooking with remaining batter, greasing the pan as needed. Serve warm with maple syrup, fresh berries, and optional powdered sugar.