Soak cèpes in hot water about 1 hour or until soft. Pour through a wire-mesh strainer, and discard any hard stems. Press ce@Spes between layers of paper towels and coarsely chop.
Saute shallots, garlic, and thyme in hot oil in a large skillet 1 minute. Add cèpes, potato, and squash, and saute 1 minute. Stir in broth, cream, salt, and pepper; simmer 10 minutes or until potatoes are tender.
*Note: Cèpes are also called porcini mushrooms.