01 - Place the potatoes in a large pot. Cover with cold water and add a generous pinch of salt. Bring to a boil over medium-high heat.
02 - Reduce heat and simmer for 15-20 minutes, or until potatoes are fork-tender.
03 - Drain the potatoes thoroughly and return them to the hot pot.
04 - Add butter, warm milk, salt, and pepper. Mash until smooth and creamy, adjusting seasoning to taste.
05 - Serve hot, topped with a pat of butter if desired.