Cook pasta according to package directions for al dente; drain.
Season chicken with Italian seasoning. Grill until cooked, about 5 mins each side. Rest, then cut into pieces.
Roughly cut mushrooms and cut zucchini & squash into pieces. Sauté in skillet with butter. Set aside.
In a pan, whisk cream and mascarpone until smooth and heated through. Stir in sun-dried tomatoes, spinach, mushrooms, zucchini & squash, Parmesan, spices and basil. Add pasta; stir to coat and cook until heated through.
Serve with chicken, Parmesan cheese and fresh basil leaves if desired.