1. In a large mixing bowl, combine the mashed potatoes, cheddar cheese, Parmesan cheese, flour, eggs, garlic powder, onion powder, salt, and pepper. Mix until all ingredients are well incorporated.
2. Fold in the chopped chives if you’re using them. This will add a fresh pop of color and flavor to your puffs.
3. Shape the mixture into small balls, about the size of a golf ball. If the mixture is too sticky, lightly flour your hands to make shaping easier.
4. Heat oil in a deep skillet over medium-high heat, ensuring it’s hot enough for frying. Test by adding a small piece of the mixture; it should sizzle immediately.
5. Fry the potato cheese puffs in batches, turning them occasionally, until they are golden brown and crispy on all sides, about 3-4 minutes per batch.
6. Remove the puffs with a slotted spoon and drain on a paper towel-lined plate to remove excess oil.
7. Serve warm and enjoy the delightful crunch followed by a creamy, cheesy interior.

Remember, patience is key while frying. Avoid overcrowding the pan to ensure each puff cooks evenly and achieves that perfect golden crisp.