Combine bread crumbs, Parmesan, parsley, garlic powder, black pepper and salt on a plate. Add aquafaba to a bowl and place nutritional yeast on a plate. Set aside.
Remove the mashed potatoes from the refrigerator. Using a small cookie scoop, scoop out the potatoes into your hand and roll into the shape of a ball. Place on a plate and repeat until all of the potatoes are used up.
Roll each ball into the nutritional yeast, followed by the aquafaba and then the bread crumb mixture. Place on a plate and continue until all of the balls are coated.
If your brand of air fryer comes with an elevated crisper plate/tray, be sure to insert it into the basket. Lightly grease the crisper plate or bottom of the air fryer basket with a non-propellant olive or avocado oil spray.
Place the potato balls in a single layer in your air fryer basket. Lightly spray the tops of the potato balls with a non-propellant olive or avocado oil spray and air fry at 390° F for 10-15 minutes until the potato balls are golden brown but not burned, lightly shaking the basket 3-4 times during cooking.