01 - Place the potatoes in a large pot, cover with cold water, and add a generous pinch of salt.
02 - Bring the pot to a boil over medium-high heat, then reduce heat and simmer for 15–20 minutes or until the potatoes are fork-tender.
03 - Drain the potatoes thoroughly using a colander and return them to the hot pot.
04 - Add butter, warmed milk, salt, and black pepper to the potatoes. Mash until smooth and creamy, adjusting the seasoning to taste.
05 - Serve immediately while hot, adding a pat of butter on top if desired.