Preheat & Prep: Preheat your oven to 350°F. Grease a 9x13-inch baking dish with butter.
Mix the Base: In a medium bowl, combine Minute Rice, cream of chicken soup, cream of celery soup, and one can of water. Stir well and pour into the prepared dish.
Add Chicken: Arrange the chicken breasts on top of the rice mixture.
Top with Flavor: Sprinkle the dry onion soup mix evenly over the chicken.
Bake: Cover the dish tightly with foil and bake for about 90 minutes. The chicken should be cooked through, and the rice will absorb the flavorful liquid.