In Dutch oven, brown Italian sausage, remove from pan, set aside and allow grease to drain off.
Over medium-high heat sauté onion, mushrooms and green peppers in EVOO, 3-5 minutes until soft.
Add remaining ingredients and sausage, expect for mozzarella cheese, bring to boil, reduce to simmer for 1 hour.
Server with shredded mozzarella, parmesan, red pepper flakes and fresh basil.