10basil leaves depending on how large your chicken breasts are
salt and pepper to taste
balsamic vinegar for drizzling, optional
Instructions
In a rimmed 11x7 or equivalent baking dish, add the chicken, garlic, olive oil, balsamic vinegar, salt and pepper and mix to coat the chicken on all sides. Cover and marinate in the refrigerator as long as possible. 30 minutes all the way to 24 hours.
To bake, it's fine to leave the chicken in the marinade, but you can transfer your chicken to a clean rimmed baking dish if you prefer. Preheat the oven to 400 and add the baking dish to the oven during the preheating phase so your dish doesn't break in the heat.
Bake until the chicken is about half done; 10 to 12 minutes. Remove from the oven and use a knife to make slits 1/2 inch apart about 3/4 of the way through the chicken. Don't cut all the way through.
Into each slit, add a half slice of tomato, a leaf of basil and a slice of mozzarella.
Sprinkle with a big pinch of salt and pepper over each chicken breast and return to the oven.
Bake until the chicken is cooked through and reaches an internal temperature of 165, and the cheese is melted: Another 10 to 12 minutes.
Allow the chicken to rest 10 minutes before serving.