Bacon Egg And Hash Brown Casserole

Name: Bacon Egg And Hash Brown Casserole
Prep time: 15 min
Cook time: 50 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1/2 lb bacon (chopped); 1 medium onion (chopped (1/2 cup)); 1 bag (30 oz frozen country-style shredded hash brown potatoes, thawed, patted dry); 2 cups shredded Cheddar cheese (8 oz); 1/4 cup grated Parmesan cheese; 9 large eggs; 1 1/4 cups milk; 1 container (8 oz sour cream); 1 teaspoon salt; 1 teaspoon ground mustard; 1/4 teaspoon pepper; 1/2 cup cornflake crumbs or panko bread crumbs; 2 tablespoons butter or margarine (melted)