Set oven temperature to 350°F.
We use a 2-quart 10 x 8-inch baking dish, so we either coat it with cooking spray or delicately brush it with oil.
In a large basin, melt the butter. After 30 seconds in the microwave, mix, and cook for an additional 10 seconds at a time until melted.
Stir thoroughly to combine the frozen hash browns with the butter.
Add the sour cream, cream of chicken soup, shredded cheese (one-quarter cup), black pepper, onion powder, and garlic powder after that. Mix well to blend.
Using a rubber spatula, transfer the mixture to the casserole dish that has been buttered and level it out.
Bake, uncovered, for 45 to 50 minutes, or until the edges are bubbling and heated.
After taking the casserole dish out of the oven, sprinkle the leftover ½ cup of cheese on top. Bake until melted, about 15 minutes.
Before serving, let the dish sit for approximately ten minutes. If preferred, garnish with finely chopped parsley, chives, or green onions, and savor.