Spread 4 slices cubed bread (whole wheat) 1/2 in greased 9x13 pan. Sprinkle 1/2 cup cheddar cheese (shredded) on top of bread, 2 cups ham or Spam or Canadian bacon, more cheese, 4 more slices cubed bread (whole wheat). Beat 6 eggs with 2 1/2 cups of milk; pour on top. Refrigerate overnight. Remove from refrigerator 1/2 hour before baking. Bake at 350 degrees for 1 hour.