Place thawed chicken into roasting pan.  Combine next 4 ingredients and sauté in skillet over medium heat for 9 to 10 minutes, or until vegetables become tender but not brown. Remove from heat. Add marinara sauce to vegetables. Stir well. Pour over chicken.

 

Roast in preheated conventional oven at 375 degrees F for 85 to 90 minutes, or until juices run clear when chicken is pricked. Remove from oven. Keep warm. Serve 1 breast half with 1/4 cup pan sauce. Accompany with green beans.