In a large mixing bowl, combine the mashed potatoes, shredded cheese, salt, and pepper.

Use a spoon or cookie scoop to form small balls, each about the size of a golf ball.

Prepare three shallow dishes: one with flour, one with the beaten eggs, and one with breadcrumbs.

Roll each potato ball in flour, dip into the egg mixture, and coat with breadcrumbs.

In a frying pan or deep fryer, heat oil over medium heat until it reaches 350°F.

Carefully place a few croquettes in the hot oil, frying until golden brown, about 3-4 minutes per side.

Using a slotted spoon, remove the croquettes and place them on paper towels to drain excess oil.

Let the croquettes cool slightly before serving.