Oven- Roasted Mushroom Soup

Recently, I've made the mushroom appetizer, the Coq au Zin, and now this soup. Clearly I enjoy mushrooms. Give me your Portabellos, Shanterelles or Porcinis... I'll happily eat them all. Luckily, my husband is equally happy with all things mushroom, and my son... well, he'll eat them only if they're pulverized and hidden inside of meatloaf. (I once made Mushroom Veggie Burgers made completely