Sausage and Egg Casserole

In a skillet, brown and crumble sausage; drain and set aside. In a large bowl, beat eggs; add milk, salt and mustard. Stir in bread cubes, cheese and sausage. , Pour into a greased 11x7-in. baking dish. Cover and refrigerate for 8 hours or overnight. Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350° for 40 minutes or until a knife inserted in center comes out clean.