01 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl until well combined.
02 - Combine ricotta, milk, egg yolks, melted butter, lemon zest, lemon juice, and vanilla in a separate bowl. Mix until completely smooth.
03 - Pour wet ingredients into dry ingredients. Stir gently with a spatula just until combined. Small lumps are acceptable; do not overmix.
04 - Beat egg whites in a clean bowl until soft peaks form. Gently fold into batter using a spatula until just incorporated.
05 - Preheat a nonstick skillet or griddle over medium heat. Lightly grease with butter or cooking oil.
06 - Pour 1/4 cup batter per pancake onto skillet. Cook 2-3 minutes until bubbles form on surface and edges appear set. Flip and cook 1-2 minutes until golden brown and cooked through.
07 - Arrange pancakes on plates. Top with fresh mixed berries, drizzle with maple syrup or honey if desired, and dust with powdered sugar.