Cheesy Ham and Hash Brown Casserole

1 (32 ounce) package frozen hash brown potatoes

8 ounces cooked, diced ham

2 (10.75 ounce) cans condensed cream of potato soup

1 (16 ounce) container sour cream

2 cups shredded sharp Cheddar cheese

1 ½ cups grated Parmesan cheese

Preheat oven to 375 degrees F (190 degrees C). Lightly grease a 9x13 inch baking dish.

In a large bowl, mix hash browns, ham, cream of potato soup, sour cream, and Cheddar cheese. Spread evenly into prepared dish. Sprinkle with Parmesan cheese.

Bake 1 hour in the preheated oven, or until bubbly and lightly brown. Serve immediately.