Boil the Potatoes: Place the cubed potatoes in a large pot of salted water. Bring to a boil and cook for 15-20 minutes, until fork-tender.
Drain and Mash: Drain the potatoes and return them to the pot. Mash with a potato masher or ricer until smooth and fluffy.
Add Cream and Butter: Warm the heavy cream and butter in a saucepan, then gradually mix into the potatoes until fully incorporated.
Season to Perfection: Add salt and pepper to taste, adjusting as needed.
Garnish and Serve: Sprinkle with fresh chives and serve warm.