Preheat your oven to 350°F. Lightly grease a 9×13-inch baking dish to prevent sticking and make cleanup easier. This step ensures even cooking from the start.
In the prepared dish, combine the cream of chicken soup, cream of mushroom soup, chicken broth, uncooked rice, and onion soup mix. Stir well until the mixture is smooth and evenly blended. This creamy base will cook the rice perfectly.
Place the chicken breasts directly on top of the rice mixture. Do not stir them in. The chicken will cook while the rice absorbs the flavorful liquid below.
Cover the dish tightly with aluminum foil. This is the key “no-peek” step, so avoid lifting the foil while baking. Bake for about 1 hour and 15 minutes until the chicken is fully cooked and the rice is tender.
Remove the dish from the oven and let it rest for 5–10 minutes. This allows the rice to settle and absorb any remaining moisture. Serve warm and enjoy immediately.