Grilled Balsamic Bruchetta Chicken. Balsamic Grilled Bruschetta Chicken 4 boneless skinless chicken breasts, thawed (I use the big Costco bag) Pinch of salt ¼ Cup balsamic vinegar ¼ Cup extra virgin olive oil 8 slices fresh mozzarella cheese 4 Roma Tomatoes, seeded and diced 8 fresh basil leaves, stacked, rolled and thinly sliced into chiffonade 3 cloves fresh garlic, minced Pinch of salt 1 Tablespoon balsamic vinegar