Cook chicken in hot oil in large skillet over medium heat 12 minutes, turning once. Remove chicken; keep warm.
Cook & stir zucchini & onion in same skillet over medium-high heat, 5 minutes or until crisp-tender. Add undrained tomatoes & Italian seasoning. Bring to boil; reduce heat. (You may add some fresh garlic, if desired.)
Return chicken to skillet; heat through. Sprinkle with cheese. Garnish with fresh basil, if desired.