2 tablespoons fresh chopped parsley (or basil, to garnish)
Method
Preheat oven to 220°C | 430°F.
Place chicken breasts in a baking dish and drizzle with olive oil. Season with oregano, basil, salt, pepper and 1 tablespoon of minced garlic. Rub seasoning all over each breast. Arrange the tomatoes and red onion around the chicken in the dish.
Whisk together the balsamic vinegar, sugar and remaining garlic in a jug to combine. Pour over the chicken breasts, flip each breast in the sauce to evenly coat.
Bake in preheated oven for 20-25 minutes (depending on the thickness of your chicken breasts), or until no longer pink in the middle. Sprinkle with cheese and broil (or grill) for 4-5 minutes, or until cheese is melted and golden.
Garnish with parsley, and serve with rice or pasta drizzled with the pan juices.