Wash all the dirt off the potatoes, and peel them. Placing them in cold water until they are all peeled.
Cut potatoes into even chunks, so they cook at the same time.
Place them in a pot and cover the potatoes with cold water, and add salt.
Bring to a simmer and cook until very tender.
Testing them with a knife, they will slide right off the knife with no resistance.
Drain well so there is no extra water.
Add warmed butter, then add warm milk or cream. (Cold milk/butter will make mashed potatoes gummy)
Season with salt and pepper.
Keep warm until served.