Combine red onions, olive oil, balsamic, 1/4 tsp. salt and 1/2 tsp. pepper. Set aside a few minutes.
Chop the tomatoes and place them in a large bowl. Combine with garlic, basil, onion, and balsamic vinegar combination and then add 1/8 tsp. salt and pepper. Set aside and let it sit at least 10 minutes (overnight if preferred).
Preheat grill to medium-high, and spray with vegetable oil to keep from sticking to the grates.
Season chicken (4-(9 oz. raw chicken) with salt and pepper. Grill the chicken for 2-3 minutes on each side, or until it reaches 165*F internally.
After grilling move to a plate and top each chicken breast with tomato bruschetta.
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