Heat the oven to 375F. Cook the pasta in a large saucepan as dircted on the package, omitting the salt.
In the mean time, heat the oil in large fryong pan on medium heat. Add in the zucchini,mushrooms & garlic. Cook & stir for about 3 to 4 mins or until zucchini is crisp & tender.
Then add in the flour & seasonings. Cook & stir again for about 1 to 2 mins. Stir in the broth, cook for another 2 to 3 mins or until thickened. Add in the Neufchatel cheese, cook & stir for about 2 to 3 mins or until the cheese has melted.
Drain the pasta, return to the pan & add in the zucchini mixture. Then add in the spinach,parmesan & 1/2 cup mozzarella. Mix lightly & spoon into 2 qt. casserole dish. Spray with cooking spray. Then top with remaining mozzarella.
Bake for about 10 mins or until mozzarella is melted.