Good-Cooking - Best Ever Hotcakes

Ingredients

• 2 eggs, separated
• 1 tablespoon granulated sugar
• 3/4 teaspoon salt
• 1 cup all-purpose flour, sifted
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 cup milk
• 1/3 cup sour cream
• 4 tablespoons butter, melted