Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.

In a large mixing bowl, combine leftover mashed potatoes, shredded cheese, and egg. Add breadcrumbs and your choice of seasonings, then mix until well incorporated.

Shape the mixture into small balls or puffs about the size of a golf ball and place them on the baking sheet.

Lightly spray or drizzle the tops of the puffs with cooking oil to achieve a crispy exterior.

Bake for 20-25 minutes, flipping each puff halfway through for even browning. They are done when golden brown.

Remove from oven and let cool for a few minutes before serving warm.