01 - Place peeled and chunked potatoes in a large pot and cover with cold water, adding a generous pinch of salt.
02 - Bring water to a boil over medium-high heat, then reduce heat and simmer until potatoes are fork-tender, approximately 15 to 20 minutes.
03 - Drain potatoes thoroughly and return them to the hot pot to evaporate residual moisture.
04 - Add cubed butter and mash potatoes until mostly smooth using a masher or ricer.
05 - Gradually pour in heavy cream while mashing and stirring until the texture is creamy and free of lumps.
06 - Adjust seasoning with salt and freshly ground black pepper to taste.
07 - Serve hot, topped with additional butter and a sprinkle of chopped chives or parsley as desired.