Sauté onion, mushrooms, zucchini, and garlic in butter until crisp-tender. Stir in drained tomatoes and seasonings.
3 In pasta pot or large bowl, combine vegetables, pasta, and chicken. Spoon into baking dish.
4 In a small saucepan, cook heavy cream and cheeses over low heat until cheese melts, stirring frequently. Pour sauce over pasta.
5 Cover and refrigerate at least 8 hours or overnight.
6 Bake, uncovered, at 350 degrees for 45 minutes or until bubbly throughout. Serve with additional Parmesan and/or chopped fresh basil if desired.