Velveeta
Mashed potatoes
Ritz crackers or potato chips, crushed*
*This is a good way to use those leftover potato chip crumbs that are always left at the bottom of the bag.
You might experiment with different flavored chips to see how they change the taste. For example, sour cream and cheddar chips, onion flavored chips or even some nacho flavored chips would create interesting flavors.
