Baked Balsamic Chicken

4 chicken breast halves or equivalent amount of chicken
1/4 cup balsamic vinegar
1 T olive oil
1 1/2 t dried oregano
1 t salt
1/2 t pepper

Arrange chicken in a 9 x 13" baking dish. Pour vinegar over chicken; sprinkle evenly with the oil, oregano, salt and pepper. Bake at 400 degrees for 20 minutes and then baste with vinegar juices from the bottom of the dish. Bake 20 minutes more or until done. Serve with any remaining liquid, if desired.