The problem with grilled cheese is that it limits you to the size of the bread and sure there are some relatively large sour doughs out there, but a classic grilled cheese is all about the white bread. Of course, if you make your own bread then the size is the limit.
The geniuses over at HellthyJunkFood did precisely that and the finished project, which took 20 slices of cheese to finish, is a true 3,650 calorie, comfort food masterpiece.
You can find the recipe here.