Step 1: Prepare the Mixture

1. Combine Ingredients: In a large bowl, mix together the chilled mashed potatoes, egg, shredded cheddar cheese, chives, flour, garlic powder, salt, and pepper until fully combined.

Step 2: Shape the Puffs

1. Form into Balls: Using your hands, roll the mixture into 1-inch balls.
2. Coat in Parmesan: Roll each ball in grated Parmesan cheese to give them a crispy, cheesy exterior.

Step 3: Bake

1. Preheat Oven: Set your oven to 400°F (200°C).
2. Prepare Baking Sheet: Line a baking sheet with parchment paper and place the coated potato puffs evenly apart.
3. Bake: Bake for 15-20 minutes, or until golden brown and crispy on the outside.

Step 4: Serve & Enjoy!

1. Let Cool Slightly: Remove from the oven and allow the potato puffs to cool for a few minutes.
2. Serve Warm: Enjoy these cheesy, garlicky delights as-is or with a dipping sauce like ranch, sour cream, or marinara.