Preheat oven to 375 degrees F. Spray a 2-quart baking dish with cooking spray.
In prepared dish, whisk together condensed soup, uncooked rice, broth, and onion powder. Season chicken breasts on both sides with salt and pepper, to taste. Place chicken breasts on top of rice mixture in the dish.
Cover tightly with foil. Bake (covered) for 1 hour, or until chicken reaches an internal temperature of 165 degrees F and the rice is tender. Stir rice, sprinkle cheese on top, and return dish to the oven (uncovered), just until cheese melts (about 3-5 more minutes).
Garnish with fresh parsley just before serving, if desired.
