How to Make It
Put the potatoes in a large pot, cover with water and bring to a boil. Simmer over moderate heat until tender, about 25 minutes. Drain and return the potatoes to the pot. Cook over moderate heat for 1 minute, shaking the pot to dry the potatoes.
In a large saucepan, melt the butter in the cream. Working over the saucepan, pass the hot potatoes through a ricer or food mill. Stir with a wooden spoon until light and fluffy. Season with salt and pepper and stir in the chives.