Creating these incredible leftover mashed potato cheese puffs is a straightforward process. Just follow these simple steps:

1. In a large mixing bowl, combine the leftover mashed potatoes, shredded cheese, flour, egg, garlic powder, onion powder, salt, and pepper.
2. Mix until the ingredients are well combined and form a cohesive mixture.
3. If the mixture feels too sticky, add a bit more flour until it’s manageable.
4. Preheat your oven to 400°F (200°C) if baking. Alternatively, heat oil in a frying pan over medium heat.
5. Scoop tablespoon-sized portions of the mixture and shape them into balls or patties with your hands.
6. If baking, place the shaped cheese puffs on a greased baking sheet. Lightly spray the tops with cooking spray. Bake for 15-20 minutes, or until golden brown.
7. For frying, gently place the puffs in the hot oil, cooking for 3-4 minutes on each side or until golden and crispy.
8. Remove from the oven or oil and let cool on a paper towel for a moment to absorb excess oil.
9. Serve warm and enjoy!

These steps will guide you easily through the process of making leftover mashed potato cheese puffs.