01 - In a large mixing bowl, thoroughly blend the mashed potatoes, cheddar cheese, green onions, garlic powder, black pepper, salt, and one egg until even and well combined.
02 - Scoop heaping tablespoons of the potato mixture and roll each portion into a ball approximately 1 1/4 inches in diameter. Arrange prepared balls on a tray.
03 - Place flour in one bowl, beaten eggs in a second, and breadcrumbs in a third. Line bowls up for efficient coating.
04 - Dredge each ball in flour, dip in beaten eggs, and roll in breadcrumbs to ensure a thorough coating on all sides.
05 - Arrange the breaded balls on a tray and refrigerate for at least 20 minutes to help them set and maintain their shape while frying.
06 - Pour vegetable oil into a deep fryer or heavy-bottomed pot and heat to 350°F (175°F). Confirm temperature with a kitchen thermometer.
07 - Carefully add chilled potato balls in batches to the hot oil, frying 2–3 minutes per batch and turning occasionally, until golden brown and crisp.
08 - Lift fried potato balls from oil using a slotted spoon. Drain on paper towels and serve immediately while hot.