01 - Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray or a small amount of oil.
02 - In a large mixing bowl, combine uncooked rice, diced onion, red bell pepper, corn, drained black beans, diced tomatoes with chilies including juices, chicken broth, cumin, smoked paprika, chili powder, garlic powder, salt, and pepper. Stir thoroughly until all spices are evenly distributed.
03 - Pour the rice and vegetable mixture evenly into the prepared baking dish, spreading it out to create a uniform layer.
04 - Nestle the chicken pieces into the rice mixture, pressing them down slightly so they are partially submerged. Distribute evenly throughout the dish.
05 - Cover the baking dish tightly with aluminum foil, sealing the edges to trap steam. Bake for 35 minutes to allow rice to absorb liquid and chicken to cook through.
06 - Remove foil carefully to avoid steam burns. Sprinkle shredded Mexican cheese blend evenly over the entire surface. Return to oven uncovered and bake for 10-15 minutes until cheese is melted and bubbly with golden spots.
07 - Let the casserole rest for 5 minutes before serving to allow flavors to meld and make portioning easier. Garnish with fresh cilantro, sliced jalapeños, sour cream, and lime wedges if desired.