Did you know mashed potatoes is a great way to thicken your soups without using cornstarch or flour? If you have leftover mashed potatoes around the house, and a few common produce items in your fridge, this soup is a great way to use up those leftovers! If you have leftover ham from Thanksgiving too, you could add that as well. This soup is completely flexible and a great way to use some of your leftover food. Enjoy!