Paula Deen's Southern Hashbrown Casserole on BakeSpace.com

Ingredients

• 3 tablespoons butter
• 1 small yellow onion, chopped
• 4 cups frozen shredded hash browns
• 1 pound bulk sausage, mild, hot or sage
• 2 1/4 cups whole milk
• 8 large eggs
• 1 teaspoon salt
• 1/4 teaspoon black pepper
• 1/4 teaspoon freshly grated nutmeg
• 2 tablespoons Dijon mustard
• 8 cups cubed French or Italian bread, crusts removed
• 2 cups (1/2 pound) grated Cheddar
• 2 cups (1/2 pound) freshly grated Parmesan