Heat oven to 325. Grease 1 1/2 qt. Casserole. Scald 2 1/2 cups of the milk in small saucepan. Gradually add cornmeal mix, stirring constantly. Continue cooking and stirring until mixture looks like thick mush. Stire in egg yolks, 1 at a time. Remove from heat. Stir in remaining 1 cup milk. In bowl, beat whites until stiff. Fold into cooked mixture. Put into casserole. Bake 1 hour, until golden brown. Makes 1 pan of spoonbread.