Creating Cheesy Hashbrown Casserole is straightforward. Follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Mix Ingredients: In a large mixing bowl, combine the thawed hashbrowns, sour cream, cream of chicken soup, cheddar cheese, chopped onion, melted butter, garlic powder, salt, and black pepper.
3. Stir Well: Mix all the ingredients until they are thoroughly combined.
4. Transfer to Dish: Spread the mixture evenly into the prepared baking dish.
5. Add Topping: If desired, sprinkle crushed cornflakes on top for extra crunch.
6. Bake: Place the dish in the preheated oven and bake for 45 minutes or until the top is golden brown and bubbly.
7. Cool Slightly: Remove from the oven and let it cool for about 10 minutes before serving. This step helps the casserole set up a bit more.
8. Serve: Cut into squares and serve warm.

These steps ensure you create an amazing Cheesy Hashbrown Casserole that will impress everyone at your table!