Preheat your oven to 350°F (175°C).
In a large bowl, combine sour cream and cream of chicken soup.
Stir in the melted butter, mixing until smooth.
Add the diced onion and seasonings (salt, pepper, garlic powder, onion powder).
Mix in the frozen hash browns until well coated.
Fold in 1.5 cups of shredded cheddar cheese.
Transfer the mixture into a greased 9x13 inch baking dish.
Spread it evenly and top with the remaining cheese.
Bake in the preheated oven for 45 minutes or until golden brown.
Let it cool for a few minutes before serving and garnish with fresh herbs.