Today I made mushroom soup from a recipe of Lindsey Bareham in "A Celebration of Soup".
Obviously I can't quote the recipe here as I have no doubt it will be copyright, but if you don't have her book, go out and buy it now! It is the best book on soups ever.
The only other good mushroom soup I made was when I was offered, I don't know how many mushrooms , but it was most of a good sized basket. I just made this soup by melting some butter and chopping up all those mushrooms, sauteing them with some onions then adding chicken stock and bringing it to the boil before simmering them for about an hour.
Then, of course, off to the blender and the addition of some milk.