01 - Place the potato chunks in a large pot and cover with cold, salted water.
02 - Bring to a boil over medium-high heat, then reduce to a simmer and cook for 15 to 18 minutes until potatoes are fork-tender.
03 - Drain the potatoes thoroughly and return them to the hot pot. Let them steam dry for 1 to 2 minutes.
04 - Mash the potatoes until smooth using a potato masher or ricer.
05 - Add softened butter, warm milk, and heavy cream. Stir continuously until the mixture is fully combined and creamy.
06 - Season with salt and freshly ground black pepper to taste. Transfer to a serving bowl and garnish with chopped chives or parsley if desired.