01 -
Preheat oven to 350°F. Grease a 9×13-inch baking dish with unsalted butter.
02 -
In a medium bowl, combine the cream of chicken soup, cream of mushroom or celery soup, water, and Minute rice. Stir until well blended.
03 -
Pour the rice mixture into the prepared baking dish. Arrange chicken breasts on top in a single layer.
04 -
Sprinkle the dry onion soup mix evenly over the chicken breasts.
05 -
Cover the dish tightly with aluminum foil. Bake for 90 minutes or until the rice has absorbed all the liquid and the chicken is fully cooked (internal temperature should reach 165°F).
06 -
Remove from oven and allow the casserole to rest, covered, for several minutes before serving.