In a large bowl, combine your chilled mashed potatoes, shredded cheddar cheese, egg, garlic powder, parsley (if using), and a pinch of salt and pepper. Mix until everything is well incorporated and smooth. The mixture should be firm enough to roll without sticking too much to your hands.

Scoop about a tablespoon of the mixture and roll it into a ball using your hands. If your hands get sticky, wet them lightly with water. Place each ball on a tray lined with parchment paper. You should get around 16 to 18 balls.

Pour the panko breadcrumbs into a shallow dish. Roll each potato ball in the breadcrumbs until it’s completely coated. Press gently so the crumbs stick well and create that crunchy outer layer.

Preheat your air fryer to 375°F (190°C). Lightly spray the air fryer basket with cooking spray. Place the balls in a single layer, leaving a bit of space between them. Spray the tops with a bit more cooking spray. Air fry for 10-12 minutes, flipping halfway through, until they’re golden brown and crispy.

Serve immediately while they’re hot and crispy! They’re perfect on their own, or you can dip them in ranch, sour cream, or your favorite sauce.