Remove and discard crust from bread if desired. Butter bread; cube and place in a greased 13-in. x 9-in. baking dish. Sprinkle with the cheese, sausage, red pepper and onions in order given.
In a large bowl, beat eggs. Add the soup, milk, wine, mustard and pepper. Pour over bread mixture; cover and refrigerate overnight.
Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350° for 45-55 minutes or until a knife inserted near the center comes out clean. Let stand for 5 minutes before cutting. Yield: 8-10 servings.