01 -
Preheat your oven to 400°F and grease a muffin pan with cooking spray or butter.
02 -
In a large bowl, mix together the chilled mashed potatoes, egg, shredded cheddar, chives, flour, onion salt, salt, and pepper until well combined.
03 -
Roll the mixture into 1-inch balls, then coat each ball in grated Parmesan cheese.
04 -
Place the coated potato balls into the prepared muffin pan and gently press down to form a puff shape.
05 -
Bake for 15-20 minutes, or until the puffs are golden brown and crisp on the outside.
06 -
Let them cool for a few minutes before removing them from the pan and serve warm.