Heat the oven to 400°F and lightly grease the cups of a mini-muffin tin.
2
Whisk together the mashed potatoes, the eggs, 3/4 cup of cheese, the chives. Season, if necessary, with salt and pepper. The seasoning will depend on how seasoned your mashed potatoes were to begin with.
3
Mound a spoonful of the mixture in each muffin cup. Sprinkle the tops with the remaining 1/4 cup of grated cheese.
4
Bake for 20 minutes, or until the potato cups are set, browned on top, and hot through. Let cool for about 5 minutes in the pan, then use a spoon or knife to gently release them from the pan. Serve immediately.