If you don't want to use butter in this grilled cheese recipe, you can skip it. You want something to act as a lubricant so that the sandwich slides and flips, though. I know someone who swears by a drizzle of olive oil in the pan when he is making grilled cheese. There are also a lot of people who say adding mayo to both sides of the bread works best when you're making a grilled cheese. Personally, I use butter and haven't tried either of those methods. If you have, be sure to leave us a comment and let us know how your grilled cheese with oil or mayo tasted.