In a greased 11-in. x 7-in. x 2-in. baking dish, combine the bread cubes and cheese. In a large bowl, whisk the eggs, milk, mustard, salt and pepper; pour over bread and cheese. Top with bacon. Cover and refrigerate overnight.
Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350 degrees F for 50-55 minutes or until a knife inserted near the center comes out clean.