Combine onion, olive oil, balsamic, salt and pepper. Set aside a few minutes.
Chop tomatoes and place in a large bowl. Combine with garlic, basil, onion-balsamic combo and additional salt and pepper to taste. Set aside and let it sit at least 10 minutes or as long as overnight. Toss in the cheese when ready to serve.
Season chicken with salt and fresh pepper. Grill the chicken cutlets on your indoor or outdoor grill, top with bruschetta and serve.
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