What’s the most important part of a grilled cheese? It’s not the bread. It’s not the cheese. It’s not all the extra junk they stuff into it at those fancy food trucks. No, it’s the butter. The butter is what separates a grilled cheese from a cheese sandwich or cheesy toast. The butter gives it that golden brown crust. The butter gives it that crunchy, savory bite. The butter makes the bread moist on the inside and crispy on the outside. The butter makes the grilled cheese.