So here's my recipe for cream of mushroom soup. I know that it's quite a significant amount of butter, but this recipe will yield about 2.5 quarts of the soup and it's in form of a soup stock (similar to condensed soup), which you can then thin more.
Despite the name, Elsa doesn't eat this. But she's my partner in the kitchen. I work the counter, she works the floor nibbling on carrots, green pepper, and tomatoes...