Belgian Waffles

1 pkg dry yeast
2 c lukewarm milk
4 eggs, separated
1 tsp vanilla
2 1/2 c sifted flour
1/2 tsp salt
1 tbs sugar
1/2 c melted butter

Dissolve yeast in milk, add egg yolks and vanilla. Add dry ingredients.
Stir in melted butter. Beat egg whites until stiff (in another bowl),
and fold into mix slowly. Let rise about 45 minutes. Preheat waffle
maker, and bake about 3/4 cup batter per waffle. Bake longer, or use
1/2 c for crispier waffles.