Add the remaining 1 tablespoon oil, zucchini and onion to the pan. Cook, stirring, until starting to soften, about 2 minutes. Increase heat to medium-high and add wine. Cook, scraping up any browned bits, until the liquid has mostly evaporated, about 2 minutes. Add tomatoes, cream cheese, Italian seasoning, garlic powder and the remaining 1/8 teaspoon each salt and pepper. 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.