Preheat your oven to 350°F (175°C).
In a large bowl, combine the shredded chicken, black beans, corn, salsa, sour cream, chili powder, cumin, and garlic powder.
Mix until all ingredients are well combined.
In a greased baking dish, spread a layer of tortilla strips on the bottom.
Pour half of the chicken mixture over the tortilla strips.
Sprinkle a layer of cheddar cheese on top.
Add another layer of tortilla strips, followed by the remaining chicken mixture.
Top with the remaining cheddar cheese.
Cover with foil and bake for 20 minutes.
Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and golden.