Creating cheesy mashed potato puffs is straightforward if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. Mix Ingredients: In a large mixing bowl, combine the leftover mashed potatoes, shredded cheese, egg, flour, garlic powder, onion powder, salt, and pepper. Mix until well combined.
3. Form Puffs: Using your hands, shape the mixture into small balls or patties, about the size of a golf ball.
4. Coat with Breadcrumbs: Roll each ball in the breadcrumbs until they are fully coated. This will give them a crispy texture when cooked.
5. Place on Baking Sheet: Arrange the coated puffs on the lined baking sheet, leaving space between each one.
6. Spray or Drizzle Oil: Lightly spray or drizzle oil over the puffs to help them crisp up in the oven.
7. Bake: Place the baking sheet in the oven and bake for 20-25 minutes or until they are golden brown and crispy.
8. Cool Slightly: Remove from the oven and let them cool for a few minutes before serving.

With these simple steps, you will have amazing cheesy mashed potato puffs ready to delight your taste buds.