All recipesCopy linkPrintSaveVegetables & SidesLeftover Mashed Potato CasseroleA delicious way to use up leftover mashed potatoes.potatocasseroleleftoverBatch size½×1×2×3×Ingredients0 of 6 gatheredClear all4 cups mashed potatoes, softened3 eggs, beaten½ cup cheese (any waxy firm cheese or combo, but not crumbly)½ cup chopped chives or green part of scallion1 large onion, diced and well caramelizedAdditional ingredients as desired (cooked bacon, salami, sauteed diced veggies, etc.)Instructions1Preheat oven to 400°F (200°C).2Combine all ingredients in a large bowl and transfer to a well-buttered 9"x12" inch casserole dish.3Bake for 40 to 45 minutes.4Alternatively, you could use muffin tins instead of a casserole dish.Reset this recipe