Heat a large nonstick skillet to medium high heat. Spray with olive oil or cooking spray.
Sprinkle all sides of chicken breast with salt and pepper. Place chicken in heated skillet and cook 4 minutes per side or until internal temperature reaches 165F. Work in batches as needed. Remove chicken from pan and return pan to heat.
Add the bell peppers, onions and garlic to the pan. Saute for three minutes and add mushrooms and Italian seasoning. Cook another 5 minutes or until mushrooms are softened.
Add can of tomatoes and cook 2 minutes or until mixture is heated through. Add chicken back to pan just to re-warm. Remove chicken to plates and top with chunky garden vegetable mixture.