10 medium potato(es), red (about 2 1/2 lbs)
1/2 cup buttermilk, warmed
3 Tbsp Parmesan cheese, strong-flavored, grated
1/4 cup chives, chopped
1 tsp table salt
1/8 tsp black pepper, freshly ground, or to taste
Place potatoes in a large pot and cover with an inch of water; bring to a boil, reduce heat, simmer and cook until fork-tender, about 30 minutes. Drain and return potatoes to pot.
Mash potatoes with a potato masher. Stir in remaining ingredients and mix well to combine. Yields about 2/3 cup per serving.