Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine shredded chicken, black beans, corn, diced tomatoes, and taco seasoning.
Stir the mixture until all ingredients are well incorporated.
In a greased 9x13 inch baking dish, layer half of the crushed tortilla chips at the bottom.
Spread the chicken mixture evenly over the chips.
Add a layer of sour cream over the chicken mixture.
Sprinkle the remaining crushed tortilla chips on top.
Finish with a generous layer of shredded cheddar cheese.
Bake in the preheated oven for 25-30 minutes, until the cheese is melted and bubbly.
Remove from the oven, garnish with chopped green onions and cilantro before serving.