Savory Overnight Sausage, Egg and Asparagus Breakfast Bake

Ingredients

• 1/2 teaspoon black pepper
• 8 large eggs
• 2 1/2 cups whole milk or non-fat milk
• 1 cup diced onion
• 1 tablespoon chopped fresh parsley for garnish, optional
• 1/2 pound white, whole wheat, or French bread, cut into 1-inch cubes (about 7 cups)
• 10 asparagus spears, ends discarded and spears cut into 1-inch pieces
• 1 teaspoon salt
• 2 teaspoons Dijon mustard
• 1 cup shredded cheddar cheese
• 1 pound ground breakfast sausage
• 1 tablespoon unsalted butter, plus more for greasing pan