Preheat the oven to 400° F. Place the three chicken breasts in a large, broiler and oven safe baking dish. Cover each breast with 1 tablespoon of pesto, 3 slices of tomato, and 2 slices of mozzarella.
Bake at 400°F for 25 minutes.Turn on the broiler and broil for 2 - 3 minutes, or until cheese starts to brown and bubble.
Remove from oven, drizzle with balsamic glaze and top with fresh basil.