If you like mashed potatoes, there's a good chance you like other starchy foods, too. Well, you can take those leftover mashed potatoes and use them to make potato bread and potato rolls. Typical recipes include ingredients like milk, butter, flour, sugar, salt, yeast and eggs, and may even add some items like nutmeg, cinnamon and lemon peel to give the bread and rolls some sweet undertones.
Often, bread machine cookbooks contain recipes for mashed potato bread. Those instructions might suggest using instant mashed potatoes, but real mashed potatoes work just as well (and typically end up tasting better).