2 tablespoons olive oil, divided
1.5 pounds chicken breasts, (4 pieces total)
Salt and pepper
3 garlic cloves, minced
1/3 cup balsamic vinegar
2 teaspoons light brown sugar
1 pint cherry tomatoes, halved
2 tablespoons chopped fresh basil, plus additional for garnish
8 ounces fresh mozzarella cheese, cut into 8 slices