Because I hate looking for this recipe:
Mashed Potato Casserole
This recipe keeps as long as two days in the refrigerator which means you have time to get the stains from peeling potatoes off your fingers before the 25th.
Potatoes
6 oz. cream cheese
1 cup sour cream
Grated onion
1 tsp. salt
White pepper
Butter or margarine
Buttered dry crumbs
Cook as many peeled potatoes as you need, till tender. Drain and dry over heat. Mash till smooth with potato masher or electric beater. Add remaining ingredients and beat till light and fluffy. Bring to room temperature and spoon into a greased casserole (a souffle dish is ideal) and top with dry crumbs tossed in melted butter or margarine. Cover and refrigerate. On the 25th, bake at 350°F for 30 minutes or till heated through. Or follow your favorite recipe, adding 2 beaten egg yolks while beating.
Of course, when I find it, I'm always disappointed, because I'm always looking for it because I can't remember how many potatoes I'm supposed to use for every 6 oz. cream cheese and cup sour cream. Psy. Incidentally, you cannot substitute low fat sour cream in this recipe - it makes the whole thing have the texture of silly putty.
Ok. 6 medium-large bakers, one large white onion, 16 oz. cream cheese, and 1 1/2 cups sour cream worked out really well.