4 large baking potatoes
1 stick butter
1 cup grated cheddar cheese
3/4 cup milk, plus more if needed
2 tablespoons chopped chives, optional
Salt and pepper, to taste

Preheat oven to 425 degrees.
Wash potatoes and poke 2 or 3 vent holes in each with a fork.
Bake potatoes in oven until done, about 1 hour.
(Poke with a fork and if fork goes in easily they are done).
Remove potatoes from oven and allow to cool for 10 minutes.
Slice potatoes in 1/2 lengthwise and scoop pulp into mixing bowl being careful not to break skin.
Mash potatoes with butter, cheese, milk, and chives.
Taste-test and adjust seasoning if necessary with salt and pepper.
Spoon mashed potatoes back into skins and place in a 9 by 13-inch dish.
Return to oven and heat thoroughly.