4 skinless chicken breasts
3/4 cup shredded mozzarella cheese
1/4 cup balsamic vinegar
2 tbsps olive oil
1/2 tsps dried oregano
1/2 tsp dried basil
1 tsp salt
Freshly ground black pepper, to taste
1 1/2 tbsps minced garlic
2 cups cherry tomatoes, halved
1/4 red onion, peeled and sliced
1 tbsp brown sugar