Sweet Potato Pie
["1 1/2 c. mashed cooked sweet potatoes", "1 1/2 c. sugar", "2 1/2 Tbsp. butter or margarine, softened", "2/3 c. evaporated milk", "3 egg yolks, beaten", "1 tsp. ground nutmeg", "3 egg whites", "1 unbaked 9-inch deep dish shell"]
["Combine sweet potatoes, sugar and butter; stir well.", "Stir in milk, egg yolks, vanilla and nutmeg; set aside.", "Beat the egg whites (at room temperature) at high speed of electric mixer until stiff peaks form.", "Fold beaten egg whites into sweet potato mixture.", "Pour into unbaked pastry shell.", "Bake at 375\u00b0 for 10 minutes; reduce heat to 350\u00b0 and bake for 45 minutes, or until set."]
["potatoes", "sugar", "butter", "milk", "egg yolks", "ground nutmeg", "egg whites", "dish shell"]