Preheat the oven to 400F. Prepare a 9x13 casserole dish.
Pound chicken breasts to thin them out a little bit and make sure they're more or less even in thickness.
In a small bowl, combine all the seasoning ingredients.
Place chicken breasts on a plate, drizzle with olive oil, and then sprinkle with half of the seasoning. Rub it into the chicken, flip, and sprinkle with the rest of the seasoning, covering both sides of the chicken well.
Add black beans, corn, cooked basmati rice, green chiles, 1 cup chunky salsa, and chicken broth. Stir to combine inside the casserole dish and level out.
Add seasoned chicken inside to the casserole dish, cover with the remaining 1 cup of salsa.
Bake in the oven for 30 minutes until the chicken is fully cooked through. The thinner the chicken breasts, the quicker they'll cook, so cook for an extra 10 minutes or so if needed.
Remove the casserole dish from the oven, sprinkle with cheddar and Monterrey Jack cheese. Broil for 3-5 minutes until the cheese melts and turns slightly golden.
Garnish with avocado, cilantro, and sour cream.