1. 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 1-3/4 cups cheese, ham, chilies, onion and cilantro.
2. Whisk the eggs, milk, salt, cumin and mustard in a large bowl. Pour over bread mixture; cover and refrigerate overnight.
3. Remove from the refrigerator 30 minutes before baking. Bake, covered, at 350° for 30 minutes. Uncover; sprinkle with remaining cheese. Bake 10-15 minutes longer or until a knife inserted near the center comes out clean. Let stand for 5 minutes before cutting. Yield: 8 servings.