A great dish for a brunch–especially when your house is filled with visitors. Just mix up the ingredients the night before, then leave a note for the first one up to put it in the oven. By the time everyone is up and coffee is made, breakfast will be ready.
Spray a 9x13-inch baking dish with nonstick cooling spray.
In a skillet over medium heat, cook sausage until no longer pink. Drain well.
Place bread in prepared dish and top with the meat.
In a bowl, combine eggs, milk, cheese, mustard, and salt. Pour over the meat. Refrigerate overnight.
In the morning, preheat oven to 350 degrees F. Bake casserole for 50 minutes.