Cheat a little; it's still delicious!
Preheat oven to 350-degrees F. Pour liquid off of 2 cans new potatoes. Place in a large mixing bowl. Add 1 small jar (maybe half) prepared yellow cheese (Cheese Whiz-type). Stir in 1 cup dairy sour cream. Combine until well mixed and cheese sauce is smooth. Bake 1 hour.