Why waste your leftover mashed potatoes when you can make these mashed potato donuts instead? The milk, butter, and salt in your mashed potatoes makes these donuts even tastier, and a roll in cinnamon sugar after frying gives them an irresistible crunch. Depending on the consistency of your mashed potatoes, you may need to add additional flour during kneading, just until the dough is no longer sticky.
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