Hash Brown Casserole

Ingredients

• 1 (30-ounce) bag frozen shredded hash browns
• 11 tablespoons unsalted butter
• 4 tablespoons all-purpose flour
• ¾ cup whole milk
• ¾ cup chicken stock
• Kosher salt (such as Diamond Crystal) and black pepper
• ¼ teaspoon onion powder
• ¼ teaspoon garlic powder
• ¼ teaspoon celery salt
• 1 cup sour cream (8 ounces)
• 1 small yellow onion, finely chopped
• ½ cup shredded or grated Parmesan (1 1/2 ounces; optional)
• 2 cups grated sharp yellow Cheddar (8 ounces; see Tip)
• Chopped parsley, to serve (optional)
• 2 cups cornflakes, crushed
• 2 tablespoons unsalted butter, melted

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