Drizzle 1 tablespoon of olive oil over chicken breasts and season to taste with salt and pepper.
Place the chicken on the grill and cook for 3-5 minutes per side, or until done. Cook time will vary depending on the thickness of your chicken breasts.
In a medium bowl combine the tomatoes, mozzarella, olive oil and salt and pepper to taste.
Spoon the tomato mixture over the chicken breasts and top with sliced basil.
Drizzle with balsamic glaze then serve immediately.