01 - 
                Preheat the oven to 375 degrees F (190 degrees C). Lightly grease a 9x13-inch baking dish with cooking spray.
              
              
              
                02 - 
                Mix together hash browns, condensed soup, sour cream, Cheddar cheese, and ham in a bowl until well combined.
              
              
              
                03 - 
                Spread the mixture evenly into the prepared dish. Sprinkle with Parmesan cheese.
              
              
              
                04 - 
                Bake in the preheated oven until bubbly and lightly browned, about 1 hour.