01 -
Preheat oven to 375ºF and lightly grease a 9×13 inch baking dish with cooking spray.
02 -
In a large bowl, mix hash browns, ham, cream of potato soup, sour cream, and cheddar cheese until evenly combined.
03 -
Spread the mixture evenly into the prepared baking dish and sprinkle the grated Parmesan cheese on top.
04 -
Bake uncovered for 1 hour, or until the casserole is bubbly and lightly browned on top.