01 - Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray or oil.
02 - In a large bowl, combine uncooked rice, diced onion, red bell pepper, corn, black beans, diced tomatoes with chilies (including juices), chicken broth, cumin, smoked paprika, chili powder, garlic powder, salt, and pepper. Mix thoroughly until all ingredients are evenly distributed.
03 - Pour the rice and vegetable mixture evenly into the prepared baking dish, spreading it into an even layer.
04 - Nestle the chicken pieces into the rice mixture, pressing them down slightly so they are partially submerged. Space them evenly throughout the dish.
05 - Cover the dish tightly with aluminum foil. Bake for 35 minutes, or until rice has absorbed most of the liquid and chicken is cooked through.
06 - Remove foil and sprinkle shredded Mexican cheese blend evenly over the top. Return to oven and bake uncovered for 10-15 minutes, until cheese is melted and bubbly and rice is tender.
07 - Let the casserole rest for 5 minutes before serving to allow flavors to settle. Garnish with fresh cilantro, sliced jalapeños, sour cream, and lime wedges if desired.