01 -
Preheat the oven to 350°F (177°C). Slice the chicken breasts in half horizontally to ensure even cooking.
02 -
Spray a 9×13-inch baking dish with nonstick cooking spray to prevent sticking.
03 -
In the baking dish, combine instant rice, cream of chicken soup, cheddar broccoli soup, and chicken stock. Stir gently to blend.
04 -
Evenly layer the frozen broccoli over the rice mixture. Place the chicken breasts on top of the broccoli, nestling them into the rice.
05 -
Sprinkle mustard powder, salt, black pepper, onion powder, and paprika evenly over the entire casserole.
06 -
Cover the dish tightly with aluminum foil and bake for 45 minutes to 1 hour, until the chicken is cooked through and the rice is tender.
07 -
Remove the foil, fluff the rice gently, and sprinkle shredded cheddar cheese evenly over the chicken. Return to the oven uncovered for about 5 minutes until the cheese is melted.
08 -
Remove from the oven and serve immediately while hot.