In a large bowl, combine mashed potatoes, egg, flour, breadcrumbs, and cheese. Season with salt, pepper, and optional garlic powder.
Mix gently until well combined. If mixture is too loose, add extra breadcrumbs or flour.
Shape into golf ball-sized puffs using a scoop or hands.
Roll each ball lightly in flour, then dip in beaten egg, then coat in breadcrumbs or crushed crackers.
Choose your cooking method:
Fry at 350°F for 2–3 minutes until golden and crispy.
Bake at 400°F for 15–20 minutes, brushing with oil and turning halfway.
Air fry at 380°F for 8–10 minutes, shaking basket halfway.
Serve hot with dipping sauces of your choice.