Preheat your oven to 400°F (200°C) and lightly grease a baking sheet.

In a large mixing bowl, combine chilled mashed potatoes, shredded cheese, beaten egg, breadcrumbs, salt, and pepper. Mix until fully incorporated.

With clean hands, scoop out portions of the mixture and shape into small balls or patties. Place on the baking sheet.

Bake for 20 to 25 minutes until golden brown and crispy on the outside.

Let the puffs cool for a couple of minutes before serving warm with your favorite dipping sauces.