Creating this delectable Chicken Enchilada Rice Casserole is straightforward. Just follow these steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
2. Prepare Ingredients: Gather all the ingredients and shred the cooked chicken, if not already done.
3. Mix the Casserole: In a large mixing bowl, combine the cooked rice, shredded chicken, enchilada sauce, salsa, black beans, corn, chili powder, cumin, garlic powder, onion powder, salt, and pepper.
4. Combine Well: Stir until all the ingredients are evenly combined.
5. Prepare the Baking Dish: Grease a large baking dish (about 9×13 inches) or a similar size to prevent sticking.
6. Transfer Mixture: Pour the rice and chicken mixture into the greased baking dish, spreading it out evenly.
7. Add Cheese: Sprinkle the shredded cheese on top of the casserole mixture generously.
8. Bake: Place the baking dish into the preheated oven and bake for 30-35 minutes, or until heated through and the cheese is bubbly.
9. Cool Slightly: After baking, remove the casserole from the oven and let it cool for a few minutes.
10. Garnish: If desired, sprinkle fresh cilantro on top before serving.

These simple steps will have you enjoying a delicious Chicken Enchilada Rice Casserole in no time!