https://www.iheartnaptime.net/belgian-waffles/
In a large bowl, whisk together the flour, sugar, baking powder and salt.
Place the egg yolks into a small bowl. Then whisk in the milk, oil and vanilla. Then stir into the flour mixture.
Beat the egg whites until stiff peaks form, about 2 minutes. Then fold into the batter. Do not over mix.
Preheat your waffle iron on medium-heat, then spray with non-stick spray. Add about 1/2 cup of the batter to the grid and cook until the waffle iron goes off, about 3 minutes.