Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish with olive oil.
In a large mixing bowl, combine the bite-sized chicken pieces, uncooked white rice, frozen broccoli florets, condensed cream of mushroom soup, chicken broth, garlic powder, smoked paprika, and black pepper.
Stir the mixture thoroughly until the soup is fully incorporated into the liquid and the chicken is evenly distributed.
Pour the mixture into the prepared baking dish and spread it into an even layer using a spatula.
Cover the dish tightly with aluminum foil to ensure the steam stays trapped to cook the rice properly.
Bake in the preheated oven for 50 to 55 minutes, or until the rice is tender and the liquid has been mostly absorbed.
Carefully remove the foil and sprinkle the shredded cheddar cheese evenly over the top of the casserole.
Return the dish to the oven, uncovered, for an additional 3 to 5 minutes until the cheese is completely melted and slightly bubbly.
Remove from the oven and let the casserole rest for 5 to 10 minutes before serving; this allows the sauce to thicken to the perfect consistency.