Garlic-Mashed Potatoes

["Preheat the oven to 4oou00b0. Slice the top 1/2"" or so off of the head of garlic. Place it on a piece of aluminum foil, drizzle with a little olive oil, and seal the foil tightly. Roast for about 45 minutes, or until the garlic is soft. (Now is a good time to take the cream cheese, sour cream, and butter out of the fridge.) Cool slightly.", "Bring the potato chunks to a boil in a pot of salted water (salt it like you would pasta water), then turn the heat down to maintain a low boil and cook until fork-tender, about 10 minutes. Drain well. I usually shake them around in the warm pot again after I drain them, just to make sure they're nice and dry.", "Mash the cooked potato chunks with next 5 ingredients (cream cheese through kosher salt) and the cooled roasted garlic-just squeeze the head of garlic, and the soft roasted cloves will come out of their skins where you chopped the top off; no need to peel individual cloves. Add more salt if desired and freshly ground pepper to taste."]