Preheat your oven to 400° and grease a muffin pan with cooking spray or butter.
In a large bowl, mix together the chilled mashed potatoes, egg, shredded cheddar, chives, flour, garlic powder, salt, and pepper until well combined.
Roll the mixture into 1-inch balls, then roll each ball in grated Parmesan cheese to coat.
Place the coated potato balls into the prepared muffin pan, gently pressing down to form a puff shape.
Bake for 15-20 minutes, or until the puffs are golden brown and crisp on the outside.
Let them cool for a few minutes before removing them from the pan and serve warm!Enjoy! Notes
These can be placed in the freezer! Let them cool and then put them in an airtight container!These are very versatile! You can make them loaded by adding bacon bits and sour cream, get creative!