Slice chicken breasts in half lengthwise to make thin chicken breasts.
Season chicken breasts by sprinkling on the next 4 ingredients.
In small bowl, combine tomatoes (drained) and balsamic vinaigrette.
Place chicken in greased baking dish and cover with tomato mixture.
Bake 400 for 30 minutes.
If using parmesan cheese, sprinkle on top for last 5 minutes of baking.
Serve with pasta or by itself!