Choose starchy potatoes like Yukon Gold or Russet
Peel the potatoes if desired
Cut potatoes into evenly sized chunks
Place potatoes in a pot and cover with cold salted water
Bring to a boil, then simmer until fork-tender
Drain the potatoes well
Return potatoes to the hot pot for a minute to dry out
Mash with a potato masher or ricer
Add warm butter
Add warm milk, cream, or half-and-half gradually
Season with salt and black pepper
Mix until smooth and fluffy
Serve immediately