01 - Preheat your waffle iron according to manufacturer's instructions.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until well combined.
03 - In a separate bowl, combine egg yolks, milk, ricotta cheese, melted butter, lemon zest, lemon juice, and vanilla. Whisk until smooth and creamy.
04 - In a clean bowl, beat egg whites until stiff peaks form using an electric mixer or hand whisk.
05 - Add the wet ingredients to the dry ingredients and mix gently until just combined. Do not overmix as this can toughen the waffles.
06 - Carefully fold the beaten egg whites into the batter until incorporated, maintaining the airy texture.
07 - Lightly grease the waffle iron. Pour batter onto the preheated iron, using about 1/2 to 3/4 cup per waffle depending on your model. Cook for 3-5 minutes until golden brown and crisp.
08 - Serve warm with maple syrup, fresh berries, or a dusting of powdered sugar.