Step 2: Prepare the Mixture
In a large bowl, mix together the chilled mashed potatoes, cheddar cheese, chives, flour, garlic powder, salt, and pepper. Add the egg and stir until everything is evenly combined and the mixture holds together.
Step 3: Form and Coat the Puffs
Shape the mixture into small balls about 1 inch in diameter. Roll each ball in the grated Parmesan until it’s completely covered. Place the coated balls into the mini muffin cups and gently press them down so they fit the mold.
Step 4: Bake Until Crispy
Bake for 15–20 minutes, or until the edges become deep golden brown and the Parmesan coating turns crisp and lightly toasted.
Step 5: Let Them Set
Take the pan out of the oven and allow the puffs to rest for about 5 minutes before removing them.
Note: Removing them too soon may cause them to break apart. Letting them rest helps the egg and melted cheese firm up, giving the puffs their structure.