Place the potatoes in a medium pot and cover with cold water by 1-inch. Bring to a boil, and reduce heat to medium-low. Simmer, uncovered, until the potatoes are fork tender, 15 to 20 minutes. Drain potatoes in a colander.
Return the potatoes to the cooking pot and add the buttermilk, butter, salt, and black pepper. Mash with a potato masher or heavy fork until fluffy, about 4 minutes. Adjust seasonings with salt and pepper, to taste. Place potatoes in an ovenproof dish and cover with aluminum foil. Place mashed potatoes in a low (275 degree F) oven to keep warm until ready to serve with the pork chops.
Yield: 4 servings