Fluffy Pancakes
["2 c. flour", "2 Tbsp. sugar", "4 tsp. baking powder", "1 tsp. salt", "2 egg yolks", "2 c. milk", "2 Tbsp. melted butter", "2 egg whites, stiffly beaten"]
["Add egg whites last."]
["flour", "sugar", "baking powder", "salt", "egg yolks", "milk", "butter", "egg whites"]