Ham and Cheese Hash Brown Casserole

Ingredients

• 1 (32-oz) package frozen hash brown potatoes
• 1 pound cooked diced ham
• 2 (10.75-oz) cans condensed cream of potato soup
• 1 (16-oz) container sour cream
• 2 cups shredded sharp cheddar cheese
• 1½ cups grated parmesan cheese