Place the potatoes in a large pot and cover them with water. Bring to a boil and simmer for about 10-15 minutes until the potatoes are fork tender.
Drain the potatoes and then return them back to the pot.
Then add in the butter, milk, salt and pepper. Use an electric mixer to blend the potatoes until they are light and fluffy or use a hand masher to mash them to the consistency that you prefer.