Preheat oven to 350°F.
Wash and peel potatoes. Cut them into large chunks.
Place potatoes in a large pot of boiling water and cook until fork tender, approximately 15 minutes.
Drain the potatoes, return to pot and add butter. Mash with a potato masher. Stir in heavy cream, sour cream, cream cheese, bacon, salt, pepper and 1 ½ cups of shredded cheese and mash until desired consistency.
Lightly spray a 9×13 inch baking dish with non-stick cooking spray. Place the potato mixture in baking dish. Top with remaining ½ cup cheese and remaining chopped bacon.
Bake for 25-30 minutes or until cheese is melted. Top with chives.
