Peel and cut up potatoes; boil until tender. Drain. Season with salt, pepper and butter; whip using milk if needed. In separate bowl beat together sour cream and cream cheese until well blended; add to potatoes.
Beat all ingredients until light and fluffy.
Pour in to buttered 2 quart casserole; dot with additiona butter if you like and sprinkle with paprika. Bake 325º oven for 30 minutes.