Preheat oven: Begin by preheating the oven to 375°F (190°C). Greasing a 9×13 inch baking dish ensures easy cleanup post-baking.
Mix the ingredients: In a large mixing bowl, combine 2 cups cooked shredded chicken, 2 cups cooked rice, 1 can black beans (drained), 1 can diced tomatoes with green chilies, 1 cup corn, and half of the 1 can enchilada sauce. Stir well until everything is evenly coated.
Layer the mixture: Spread half of the combined mixture into the greased baking dish. This creates the first layer of flavor.
Add the cheese: Sprinkle half of 1 cup shredded cheddar cheese and 1 cup Monterey Jack cheese over the first layer.
Repeat layers: Top with the remaining chicken and rice mixture, ensuring even distribution. Pour the remaining enchilada sauce over the top and finish by adding the rest of the cheese.
Add garnishes: For an optional touch, sprinkle ¼ cup sliced black olives and 2 sliced green onions to elevate the visual appeal.
Bake to perfection: Place the baking dish in the preheated oven and bake for 20-25 minutes. You’ll know it’s ready when the casserole is bubbly and cheese is melted.
Garnish and serve: Allow the casserole to cool for 5 minutes. Just before serving, sprinkle ½ cup chopped cilantro on top for a burst of freshness.