The outside of these mashed potato cakes are light and crispy. Inside they're warm and soft and slightly gooey from the melted cheddar cheese. They're truly little pillows of delight!
In a large bowl, mix together the cold mashed potatoes, grated cheese, and eggs. Mix in the flour, adding more if needed, until the mashed potatoes form a soft and slightly sticky dough.
Form the dough into eight balls then press the balls down to form patties. Put a little flour into a bowl and then coat each of the mashed potato cakes in flour so they are no longer sticky.
Heat a splash of oil in a medium-sized cast iron or non-stick frying pan over medium 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 golden brown and crispy. Carefully flip the cakes over and fry until the other side is golden, too. Repeat with the remaining cakes.