Yes, grilled cheese sandwich-spread a thin layer of butter on outside of cheese sandwich, place in hot skillet and let toast on both sides. I also like to put ham on them occasionally too.
I make mine under the broiler. No butter necessary.
Why worry about the fat in a couple of grams of butter when you're eating all that cheese?
OTOH sometimes I would make a fake grilled cheese just for the convenience of not needing to clean the skillet.. Two slices of toast, cheese in the middle then a short stint in the microwave to melt the cheese. A little spread/margarine enhances the flavor.