1 lb. yams, about 3
1/2 c. sour cream
1 egg
1/2 tsp. salt
1/4 tsp. cinnamon
3/4 c. miniature marshmallows

Cook unpeeled potatoes 30-35 minutes. Peel. Heat oven to 350 degrees. In mixer bowl, combine potatoes, sour cream, egg, salt and cinnamon. Beat on medium speed until smooth. Pour mixture into buttered 1 quart casserole and top with marshmallows. Bake 30 minutes or until marshmallows are puffed and golden. Serves 4. (Can easily be doubled or tripled for company.)