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