Prep Waffle Iron: Preheat your waffle iron, spray with non stick cooking spray and set aside.
Mix Dry Ingredients:To a large bowl add the flour, cornstarch, baking powder, sugar, salt and whisk until combined.
Mix Egg Whites: In another bowl, add the egg whites and beat them with a hand mixer until stiff peaks form. Set aside.
Combine Ingredients: Add the egg yolks, melted butter, milk and vanilla extract to the bowl with the flour mix and mix until well combined. Fold in the egg whites with a spatula.
Cook: Pour the batter onto your hot waffle iron and cook according to manufacturer's directions.