American
Preheat and lightly grease a waffle iron.
Whisk the flour, baking powder, sugar, and salt together in a large bowl.
Beat the egg yolks with the milk, melted butter, and vanilla, then stir into the dry mix until smooth.
Whip the egg whites to soft peaks and gently fold them into the batter for a light texture.
Ladle batter onto the hot waffle iron and close, cooking until golden and crisp, about 4 minutes.
Repeat with the remaining batter, keeping cooked waffles warm.
Serve hot with maple syrup, berries, or whipped cream.