Preheat your machine to 375 degrees F for 5 minutes. Set buttered slice with dry side facing up on to your solid metal tray with shredded or slices of cheese on top. Lay 2nd slice of buttered bread with butter side facing up on top of that.
You can leave it open faced with just one slice and slices of cheese on top too. Slide into the machine on the middle rack for 3 minutes if open faced, or 3-4 minutes on each side (flipping with a spatula ideally halfway thru) or until lightly golden brown and cheese is melted.
Slice and enjoy warm.
** If you choose to add other ingredients into the middle put 1 slice of cheese on the bottom and on on top of your add ins. Keep an eye on it after 3 minutes on each side as it may take an additional minute since it is thicker.
Notes
Optional Add-Ins
Things you could add in between the 2 slices of cheese would be: 1-2 slices of tomato, precooked slices of bacon or a few thin slices of avocado.