Boil potatoes till tender. Drain and place in a large mixing bowl. Add butter and cream cheese and mix with an electric mixer while slowly adding the milk.
Season with salt and pepper and top with remaining chives.
To store, cover the potatoes tightly with foil and store in fridge till about ready to serve. Allow potatoes to come to sit at room temperature for 35 minutes. Place a few additional pats of butter on top. Pre-heat the oven to 350°F. Place potatoes in the oven and bake for 15-20 minutes or until nice and warm. Serve immediately.