In a large bowl, combine egg yolks and sugar.

Beat the egg yolks and sugar until well mixed.

Add vanilla extract, melted butter, and salt to the mixture.

Mix the ingredients thoroughly.

Alternately mix in flour and warm milk until the batter is well blended.

In a separate bowl, beat egg whites until soft peaks form.

Gently fold the beaten egg whites into the waffle batter.

Let the batter stand for 40 minutes.

Preheat your waffle iron and spray with non-stick cooking spray.

Pour the waffle mix onto the hot waffle iron.

Cook until the waffles are golden brown and fluffy.