01 -
Preheat your oven to 400°F (200°C). Grease a baking sheet with olive oil or cooking spray.
02 -
In a large mixing bowl, combine the leftover mashed potatoes, shredded cheddar cheese, grated Parmesan cheese, finely chopped green onions, all-purpose flour, beaten egg, garlic powder, salt, and pepper. Mix until well combined.
03 -
Shape the mixture into small balls or patties and place them on the prepared baking sheet. For extra crispiness, roll the potato cheese puffs in bread crumbs if desired.
04 -
Bake in the preheated oven for 20-25 minutes, or until the cheese puffs are golden brown and crispy on the outside.
05 -
Remove from the oven and let cool slightly before serving. Serve the leftover mashed potato cheese puffs hot as a tasty snack or side dish.