Cheesy Leftover Mashed Potato Cakes | The best way to use your Christmas or Thanksgiving leftover mashed potatoes! |

Cheesy Leftover Mashed Potato Cakes

  • Author: Kristen Stevens
  • Prep Time: 10 mins
  • Cook Time: 15 mins
  • Total Time: 25 mins
  • Yield: 8 cakes 1x
  • Category: Side Dish
  • Cuisine: American


These Cheesy Leftover Mashed Potato Cakes are crispy on the outside and cheesy and soft inside. They’re the best way to use your leftover mashed potatoes!



  • 2 1/2 cups cold mashed potatoes (from 3 medium Russet potatoes)
  • 1 1/2 cups grated cheddar cheese (I like to use aged white cheddar)
  • 1/2 cup grated pizza mozzarella
  • 1 large egg
  • 1/2 cup flour (gluten-free, if needed)
  • Neutral flavored oil, for frying (see notes)
  • Sour cream and sliced green onions, to top


  1. Taste the mashed potatoes to make sure they are seasoned well with sea salt. If needed, add some salt. In a large bowl, mix together the cold mashed potatoes, grated cheeses and the egg. Form the dough into eight balls then press the balls down to form patties. Dip each of the cakes in the flour so they are lightly coated.
  2. Heat a splash of oil in a medium-sized frying pan over medium-high heat. Once the pan is hot, add half of the leftover mashed potato cakes. Let the cakes fry for 3-4 minutes, or until the bottoms are brown. Carefully flip the cakes over and fry until the other side is brown, too. Repeat with the remaining cakes.
  3. Serve the leftover mashed potato cakes with some sour cream and green onions on top.


The amount of oil you need will depend on the type of pan you use. A cast iron pan will work best for browning the cakes, but will use more oil than a non-stick pan.