Peel the garlic skin until you pretty much have nothing but cloves. Drizzle olive oil on top. Cover with foil and pop into a 400 degree oven for 35-40 mins. (I take the foil off for the last ten minutes because I like mine darker on top).
Let cool down, then squeeze the garlic until the cloves ooze out.
You can save it for sauces or whatnot. Me, I prefer it warm, slathered on a nice piece of crusty bread with a tiny sprinkling of salt.