Flatten the chicken breast so it is all the same thickness and will cook evenly. Place the chicken breast on a cutting board. Cover with plastic wrap or parchment paper and use a meat mallet or rolling pin to gently pound starting at the thickest part of the chicken breast.
Season both sides of the chicken breasts with garlic powder, onion powder, Italian seasoning, salt, and pepper.
Heat a nonstick skillet over medium heat. Spray with cooking spray and add the chicken. Cook for 4 minutes on each side or until the internal temperature reaches 165 degrees F.
Place the chicken breasts on a baking sheet and top each one with 1 oz. of fresh mozzarella. Put the baking sheet in the oven under the broiler until the cheese is melted, about 3 minutes. Keep a close eye on it so the cheese doesn't burn.
Top each chicken breast with 2 slices of tomato, fresh basil, and a drizzle of balsamic glaze.