Step 1

Preheat the oven to 350°F. Preheat the oven to 350 degrees Fahrenheit. Grease a 9x13 inch baking dish.

Step 2

In a large bowl, mix together the thawed hash browns, melted butter, cream of chicken soup, sour cream, chopped onion, 1 cup of shredded cheddar cheese, salt, pepper, and garlic powder until well combined.

Step 3

Transfer the mixture to the prepared baking dish, spreading it out evenly.

Step 4

Bake the casserole for 35 minutes.

Step 5

Remove the casserole from the oven and sprinkle the remaining 1 cup of shredded cheddar cheese evenly over the top. Return the dish to the oven and bake for an additional 10 minutes, or until the cheese is melted and bubbly, and the casserole is heated through.

Step 6

Remove the casserole from the oven and let it rest for 5 minutes before serving.