Make-Ahead Mashed Potatoes
["6 medium potatoes (2 lb.)", "4 oz. dairy sour cream", "1 (3 oz.) pkg. cream cheese, cut up", "1 Tbsp. margarine or butter", "1/4 tsp. pepper or white pepper", "1/4 tsp. thyme", "1/4 to 1/2 c. milk", "1 Tbsp. margarine or butter", "salt to taste"]
["Cook or boil pared potatoes until tender; drain.", "In a large bowl mash with a potato masher or beat with electric mixer on low speed. Add sour cream, cream cheese, 1 tablespoon margarine or butter, salt, pepper and thyme.", "Gradually beat in enough of the milk to make smooth and fluffy.", "Turn into a greased 1 1/2-quart casserole.", "Cover with foil and chill up to 24 hours."]
["potatoes", "sour cream", "cream cheese", "margarine", "pepper", "thyme", "milk", "margarine", "salt"]