French Toast-Sausage Casserole is a delicious and hearty breakfast casserole that combines the flavors of French toast and savory sausage. This make-ahead dish is perfect for feeding a crowd or for a lazy weekend brunch. The casserole is made by layering slices of French bread, cooked sausage, and a custard mixture made with eggs, milk, and spices. It is then baked until golden and crispy on top. Serve with maple syrup or your favorite breakfast condiments.