In a large mixing bowl, combine your leftover mashed potatoes with shredded cheese, breadcrumbs, egg, garlic powder, onion powder, parsley, salt, and pepper. Blend until cohesive.

Take portions of the mixture and roll them into smooth balls or shape into patties. Place on a parchment-lined baking sheet.

Heat olive oil in a large frying pan over medium heat for about 2 minutes until shimmering.

Carefully add the formed puffs to the pan in a single layer and fry for 3-4 minutes on one side until golden brown. Flip and cook for an additional 3-4 minutes.

Transfer cooked puffs to a paper towel-lined plate to drain excess oil. Serve warm with dipping sauces.