Creating Green Chili Chicken Casserole is simple if you follow these straightforward steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Mix Ingredients: In a large bowl, combine the cooked, shredded chicken, diced green chilies, cream of chicken soup, sour cream, taco seasoning, chopped onion, garlic powder, and half of the shredded cheese. Mix until well combined.
3. Season: Add salt and pepper to taste, ensuring the mixture is flavorful.
4. Prepare Casserole Dish: Lightly grease a 9×13-inch casserole dish.
5. Layer Mixture: Spread the chicken mixture evenly into the prepared casserole dish.
6. Add Chips: Sprinkle the crushed tortilla chips evenly over the chicken mixture.
7. Top with Cheese: Add the remaining shredded cheese on top of the tortilla chips.
8. Bake: Place the casserole in the preheated oven and bake for 30-40 minutes, or until the cheese is melted and bubbly.
9. Cool: Once done, remove the casserole from the oven and let it cool for a few minutes before serving.

These steps will guide you in creating this incredible casserole effortlessly.