Place the potatoes in a saucepan of salted water to cover by 1-inch. Bring to a boil and cook until tender, about 10 minutes. Drain and return to the pot. With the heat on low, roughly mash the potatoes with a potato masher. Add the truffle butter and mash until incorporated. Add the cream, truffle oil, salt, and pepper and mash until creamy.
Yield: 2 cups