Add the remaining 1 tablespoon oil, zucchini, mushrooms & onions to the pan. Cook, stirring, until starting to soften, about 2 minutes. Cook, scraping up any browned bits, until the liquid has mostly evaporated, about 2 minutes. Add tomatoes, cream cheese & Italian seasoning. Bring to a simmer and cook, stirring to melt the cream cheese, for 5 minutes. Return the chicken to the pan and turn to coat with the sauce. Serve topped with basil or Italian parsley if desired.