Preheat your oven to 350°F (175°C).
In a large bowl, combine the shredded chicken, black beans, corn, taco seasoning, diced tomatoes (with juices), and sour cream.
Layer half of this mixture into the bottom of a greased 9x13-inch casserole dish.
Sprinkle one cup of shredded cheese over the chicken layer.
Top with the remaining chicken mixture, spreading it evenly.
Finish by sprinkling the remaining cheese and crushed tortilla chips on top.
Cover the dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden brown.
Let it cool for a few minutes, then garnish with fresh cilantro before serving.