Crispy Mashed Potato Patties

In a large bowl, combine the chilled mashed potatoes, beaten egg, flour, shredded cheese, chopped green onions, garlic powder, salt, and pepper. Stir until fully blended and the mixture holds together well.

Divide the potato mixture into equal portions (about 1/4 cup each). Roll into balls and gently flatten them into patties about 1/2-inch thick.

Heat vegetable oil or butter in a skillet over medium heat. Carefully place the patties in the hot pan, leaving space between them. Fry for 3 to 5 minutes per side until deeply golden brown and crisp.

Transfer the fried patties to a paper towel-lined plate to drain any excess oil. Serve immediately while warm and crispy.