How to Make It
In a large pot, cover the potatoes with water and bring to a boil. Salt the water and cook the potatoes over moderately high heat until tender, about 25 minutes. Drain the potatoes and return them to the pot. Shake the pot over moderately high heat for 1 minute to dry out the potatoes.
Pass the potatoes through a ricer into another pot. Add the cream, butter and buttermilk to the potatoes and stir well. Fold in the chives and season with salt and pepper. Serve piping hot.