Preheat your oven to 350°F (175°C). Lightly grease a 9x13 inch baking dish with butter.
In a mixing bowl, combine the minute rice, cream of chicken soup, cream of celery soup, and water. Stir until well blended.
Pour the rice mixture into the prepared baking dish, spreading it evenly.
Place the chicken breasts on top of the rice mixture.
Sprinkle the onion soup mix evenly over the chicken breasts.
Cover the baking dish tightly with aluminum foil.
Bake in the preheated oven for 60 minutes, or until the chicken is cooked through and the rice is tender.
Remove from oven and let it rest for 5 minutes before serving.
Notes
For added flavor, consider adding a cup of frozen vegetables to the rice mixture before baking. You can also substitute chicken thighs for the breasts if preferred.