01 - Gently toss mixed berries with sugar and lemon juice in a small bowl. Set aside to macerate while preparing pancakes.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large mixing bowl until well blended.
03 - Combine ricotta cheese, milk, melted butter, egg yolks, lemon zest, and vanilla extract in another bowl. Mix until smooth and creamy.
04 - Add ricotta mixture to dry ingredients and mix gently until just combined. Do not overmix.
05 - Beat egg whites in a clean bowl until soft peaks form. Gently fold whipped egg whites into batter until fully incorporated.
06 - Heat nonstick skillet or griddle over medium heat. Lightly grease with butter.
07 - Pour about 1/4 cup batter per pancake onto skillet. Cook for 2-3 minutes until bubbles appear on surface and edges look set. Flip and cook for another 1-2 minutes until golden and cooked through. Repeat with remaining batter.
08 - Stack pancakes on plates, top with macerated berries, and drizzle with maple syrup or sprinkle with powdered sugar if desired.