1 package dry yeast
2 cups lukewarm milk
4 eggs, separated
1 teaspoon vanilla
2-1/2 cups sifted flour
/2 teaspoon salt
1 Tablespoon sugar
1/2 cup melted butter

Sprinkle yeast over warm milk; stir to dissolve. Beat egg yolks and add to yeast mixture with vanilla. Sift together flour, salt, and sugar; add to liquid ingredients. Stir in melted butter and combine thoroughly. Beat the egg whites until stiff and carefully fold into batter. Let mixture stand in a warm place about 45 minutes or until it doubles in bulk. Use 1-1/3 cups mix per waffle. Sprinkle with powdered sugar.