Heat 1/2 tablespoon olive oil in a large skillet over medium-high heat. Add chicken breasts, cover with a lid and cook for about 8 minutes. Flip chicken breasts and continue cooking until the chicken is no longer pink and cooked thoroughly. Transfer cooked chicken on to a plate.
Add garlic and saute for about a minute. Add tomatoes and continue cooking for 3-4 minutes until tomatoes start to blister and soften.
Push to one side and return the chicken back to the pan. Top with mozzarella and cover with lid for about a minute.
Dish out chicken onto plate. Stir in basil with tomatoes and top with tomatoes. Drizzle with desired amount of balsamic vinegar/balsamic reduction and serve immediately.
Adapted from Taste of Home