Step 1: Prepare the Baking Dish: Preheat the oven to 350F (175C). Lightly grease a 9x13 inch baking dish. This prevents the rice from sticking to the bottom and ensures even cooking.
Step 2: Arrange the Chicken and Rice: Place the uncooked rice in the prepared baking dish, spreading it evenly across the bottom. Arrange the chicken breasts over the rice in a single layer. This ensures even distribution and thorough cooking of both the rice and the chicken.
Step 3: Mix the Soups and Seasonings: In a medium bowl, combine the condensed cream of mushroom soup, condensed cream of chicken soup, dry onion soup mix, water, garlic powder, and black pepper. Stir until well blended, ensuring no lumps remain. This creates a creamy and flavorful sauce that will infuse the chicken and rice as it bakes.
Step 4: Pour the Sauce Over the Chicken: Pour the soup mixture evenly over the chicken breasts and rice, making sure the rice is mostly submerged. This helps the rice cook evenly and absorb the flavors of the sauce.
Step 5: Bake the Dish: Cover the baking dish tightly with aluminum foil. Bake in the preheated oven for 1 hour. Do not lift the foil during baking, as this will release steam and affect the cooking process. This "no peek" method helps to keep the moisture in and ensures the rice and chicken cook evenly.
Step 6: Check for Doneness: After 1 hour, carefully remove the foil. Check the internal temperature of the chicken with a meat thermometer; it should reach 165F (74C). The rice should be tender and have absorbed most of the liquid. If the chicken is not fully cooked or the rice is still too firm, continue baking for an additional 10-15 minutes.
Step 7: Rest Before Serving: Let the dish stand for 10 minutes before serving. This allows the flavors to meld together and the rice to absorb any remaining liquid, resulting in a more flavorful and cohesive dish.
Optional: For a richer flavor, add 1/4 cup of butter, cut into small pieces, over the chicken before baking. Chopped vegetables, such as broccoli florets or sliced carrots, can be added to the dish along with the rice for a more complete meal. Substitute cream of celery or cheddar cheese soup for a variation in flavor.