Preheat oven to 400ºF. Whisk first 6 ingredients in small bowl until combined. Combine 2 tablespoons oil mixture and chicken in resealable plastic bag. Let stand 5-10 minutes at room temperature to marinate.
Meanwhile, heat 2 tablespoons oil mixture in medium skillet on medium heat. Add onions; cook 3-4 minutes or until crisp-tender. Stir in FarmToFork™ Tomato Basil Sauce. Pour mixture into lightly greased 13x9-inch baking dish. Arrange chicken breasts in dish, overlapping if necessary. Top with grape tomatoes and cherry tomato stems. Spoon remaining oil over tomatoes.
Bake covered, 25 minutes or until chicken is done (165ºF) and tomatoes start to burst. Sprinkle with cheese, drizzle with balsamic glaze and garnish with fresh basil leaves before serving.