1. In a large pot, saute the onion, bell pepper, and garlic in hot oil, until tender.
2. Add in the mushrooms, eggplant, and zucchini; stir.
3. Add the beef broth and wine; bring the mixture to boiling; reduce heat.
4. Simmer, covered, for 8-10 minutes or until vegetables are tender.
5. Add in the tomatoes with juice, basil, and salt and pepper to taste; cook until heated through.
6. Ladle stew into individual bowls; sprinkle with provolone cheese.