In a large bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt.
In a separate bowl, whisk together the milk, melted butter, egg yolks, and vanilla extract.
Pour the wet mixture into the dry ingredients and mix until just combined. Do not overmix; a few lumps are fine.
In a clean bowl, beat the egg whites until stiff peaks form.
Gently fold the whipped egg whites into the batter until fully incorporated.
Preheat your waffle iron according to the manufacturer's instructions. Lightly grease if necessary.
Pour the batter onto the hot waffle iron. Cook until golden brown and crispy.
Remove waffles and serve immediately with your favorite toppings.
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