Step 1
Heat the oven to 350° F. Butter a 13- by 9- by 2-inch baking dish and line with the bread cubes.

Step 2
Cover the bread with layers of ham or sausage, chopped spinach, cherry tomatoes, and grated cheese.

Step 3
In a separate bowl, whisk the eggs, dried mustard, pepper, and milk. Pour the mixture over the casserole.

Step 4
Bake for 30 minutes, then broil for 2 minutes, or until the cheese turns golden brown. Makes 8 to 10 servings.