1 loaf (1 pound) frozen bread dough, thawed
6 slices part-skim mozzarella cheese
1 can (8oz) pizza sauce
1 cup (8oz) shredded part-skim mozzarella cheese, divided
1/2 cup each finely chopped fresh cauliflowerets, mushroom and broccoli florets
1/4 cup each finely chopped red onion, green pepper and sweet red pepper
1/2 cup pickled pepper rings