Hobbits, Tolkien tells us, are very fond of mushrooms. The author himself admitted that it was one of the things that made him know he had plenty in common with hobbits. An early chapter in "Lord of the Rings", before the shadows lengthen, is called "A Short Cut to Mushrooms". At one point a basket is produced "from which the unmistakable scent of mushrooms was rising". I have never thought of mushrooms as having a scent. Be that as it may, their earthy, half meat and half vegetable nature seems to me to make them obvious fodder for the likes of Frodo and Bilbo, in their hole in the ground.
Nigel Slater has provided a delicious late supper involving mushrooms in the first book of his that I ever encountered, "Real Fast Food". Mushrooms on toast. I recall impressing Granny when she asked one evening what I was having for supper and I told her this. I cannot promise that it is an exact replica of what he says in the book but so much the better he would doubtless say.
Fry and brown your sliced mushrooms in butter. Add some thinly sliced shallot and, perhaps, a few lardons, but they are by no means essential. Then stir in a significant amount of double cream, let it bubble briefly, and serve on toast.