1 tablespoon olive oil
6 skinless, boneless chicken breast halves
1/4 cup chopped celery
1 (10 ounce) can tomato sauce
1 teaspoon freshly ground black pepper
1 tablespoon Worcestershire sauce
2 teaspoons dry mustard
Preheat oven to 375 degrees F (190 degrees C).
Season chicken breasts with salt and pepper. Remove bones, and place in a shallow dish or bowl. Add tomato sauce, black pepper, Worcestershire sauce, mustard, and celery. Mix thoroughly.
Pour mixture over chicken in a 9x13 inch baking dish. Arrange chicken breast halves in baking dish, and sprinkle with Parmesan cheese.
Bake at 375 degrees F (190 degrees C), uncovered, for 20 to 25 minutes per side, or until chicken is cooked through. Spoon chicken into chicken dish.