Breakfast Lasagna

Name: Breakfast Lasagna
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 30 min
Yield: 8
Ingredients: Ingredients; 9 lasagna noodles; 1 lb breakfast sausage; 1 medium onion, diced; 8 large eggs; 1 cup whole milk; 2 cups ricotta cheese; 2 cups shredded mozzarella cheese, divided; 1/2 cup grated Parmesan cheese; 6 strips bacon, cooked and crumbled; 2 tablespoons fresh chives, chopped; 1 teaspoon salt; 1/2 teaspoon black pepper; 2 tablespoons butter (for greasing)