Creating Chicken Hashbrown Casserole is straightforward with these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish lightly.
2. Mix Base Ingredients: In a large bowl, combine the shredded chicken, cream of chicken soup, sour cream, and garlic powder. Stir well until combined.
3. Incorporate Potatoes: Gently fold in the frozen hashbrowns, ensuring they are evenly distributed in the chicken mixture.
4. Season It: Add black pepper, salt, and half of the chopped green onions to the mixture. Stir to combine all ingredients thoroughly.
5. Add Cheese: Fold in 3/4 cup of shredded cheddar cheese into the mixture to create extra creaminess.
6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish and spread it out evenly.
7. Top It Off: Sprinkle the remaining cheddar cheese on top. If desired, add cornflakes for a crunchy topping.
8. Bake: Place the casserole in the preheated oven and bake for 45-50 minutes or until hot and bubbly.
9. Cool and Serve: Remove from the oven and let it sit for 5-10 minutes before serving to allow it to set beautifully.

This simple process will yield a satisfying and delicious Chicken Hashbrown Casserole that your family will rave about!