In a large mixing bowl, combine the cooked rice, shredded chicken, drained black beans, corn, diced bell peppers, enchilada sauce, ground cumin, chili powder, and a sprinkle of salt and pepper. Stir until well combined.
Spread half of the rice and chicken mixture evenly in a greased 9x13 inch baking dish.
Sprinkle half of the shredded cheese over the first layer of chicken and rice.
Add the remaining rice and chicken mixture on top of the cheese, smoothing it out evenly.
Top with the remaining cheese, covering it completely.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes until the cheese is melted and bubbly.
Let the casserole cool for a few minutes before serving.
Garnish with sliced green onions and fresh cilantro if desired.
Notes
Serve hot with a side of tortilla chips or a fresh green salad.