Bring large pot to boil, Preheat oven to 400 degrees
Cut zucchini in half lengthwise, leaving 1/4" thick scoop out the inside of zucchini, reserve flesh, chop and set aside. Drop zucchini in boiling water and cook 1 minute. Remove.
Coat casserole dish with thin layer of sauce, place zucchini cut side up. Brown sausage breaking up, set aside. Add onion, garlic, red peppers cook 2 minutes , add chop zucchini, add salt and pepper and cook 2 minutes. Add sausage cook additional 2 minutes. Divide between zucchini halves, top each with 1 Tbs ice, 1/2 Tbs mozzarella and parmesan. cook 30 minutes or until cheese melted and heated through.