Place the peeled and cubed potatoes in a pan and cover completely with cold water, add salt.
Bring to a boil and cook till potatoes are fork tender, not quite falling apart when you stick a fork in them.
Drain water from potatoes and place back in warm pan, add 4 Tablespoons butter and cover with a clean dishtowel and let sit for 5 minutes.
Using a electric hand mixer or stand mixer begin mashing the potatoes, and adding milk or cream till they are the desired consistency.
Place them in a serving bowl and be sure to add a big chunk of real butter to the top!