Bring 2 cups of water to a boil and add the dried mushrooms. Cover and remove from heat. Allow mushrooms to soak for 45 minutes. Drain the softened mushroom and reserve the liquid. Cut the mushrooms into ¼ inch slices and rinse them under cool running water to remove and dirt particles.
Combine butter, squash, onion, garlic, bouillon cubes, spices and 2 cups of water in a sauce pan and bring to a boil. Cover and reduce heat and simmer for 20 minutes.
Pour cooked squash mixture into a blender and puree (carefully if hot). The mixture will be thick. Add heavy cream and ½ cup of the reserved mushroom liquid to the mixture and blend inches.