Sauté sausage until cooked: drain and remove from pan.
To pan add olive oil, onions, peppers, garlic and mushrooms; sauté 5-7 minutes; add beans cook 5 minutes.
In baking dish, combine sausage, vegetables and tomato sauce. Bake at 375 degrees for 25 minutes. Remove from oven and garnish with cheese and fresh basil.