Preheat the oven to 375 degrees F (190 degrees C). Spray a large casserole dish with cooking spray.
Combine pinto beans, chicken, corn, diced tomatoes and green chiles, tomato sauce, onion, cumin, garlic powder, salt, and pepper in a large bowl.
Spread corn chips on the bottom of the prepared casserole dish and evenly distribute the bean mixture over top. Sprinkle with Colby-Jack cheese.
Bake in the preheated oven until cheese has melted and casserole is heated through, about 25 minutes. Serve immediately.
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