Preheat your oven to 350°F (175°C). This ensures that your casserole bakes evenly and thoroughly.
In a large mixing bowl, combine the cooked chopped chicken, taco seasoning, cream of chicken soup, sour cream, black beans, Rotel tomatoes, and corn. Mix until everything is well incorporated.
Pour the mixture into a greased 9x13-inch baking dish, spreading it out evenly.
Sprinkle the shredded cheddar cheese evenly over the top of the casserole. This will create a deliciously cheesy crust as it bakes.
Finally, sprinkle the tortilla strips over the cheese. This will add a delightful crunch to each bite!
Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the cheese is melted and bubbly, and the casserole is heated through.
Once done, remove the casserole from the oven and let it sit for a few minutes before serving. Enjoy your Mexican Chicken Casserole with your favorite toppings!