PREHEAT oven to 400° F. Line baking sheet with heavy-duty foil.
PLACE chicken and pesto in medium bowl; toss to coat. Place chicken on prepared baking sheet.
BAKE for 20 to 25 minutes or until chicken is no longer pink in center. Remove from oven; top with tomatoes and cheese. Bake for an additional 3 to 5 minutes or until cheese is melted.
