In a medium skillet over medium heat, brown sausage. Remove from heat and drain.
Beat together eggs, add milk, salt and dry mustard; mix well.
Grease the bottom of 13x9x2-inch baking dish. Layer soft bread crumbs, sausage and cheddar cheese. Pour egg mixture over top; refrigerate overnight. Next morning, Preheat oven to 350° F.
Bake casserole for 45 minutes; let stand about 5 minutes before cutting.Servings: 6