01 -
Preheat oven to 175°C. Lightly grease a 33x23 cm baking dish with butter or non-stick spray.
02 -
In a large bowl, thoroughly mix thawed hash browns, diced ham, shredded cheddar, shredded mozzarella, chopped onion, melted butter, cream of chicken soup, sour cream, garlic powder, onion powder, salt, and black pepper until ingredients are evenly incorporated.
03 -
Spread the mixture evenly into the prepared baking dish, smoothing the top with a spatula.
04 -
Sprinkle crushed cornflakes or breadcrumbs evenly over the surface if a crispy topping is desired.
05 -
Cover the dish with foil and bake for 30 minutes.
06 -
Remove foil and continue baking for 10–15 minutes, or until casserole is bubbling and the top is golden brown.
07 -
Allow casserole to rest for 5 minutes before slicing and serving.