Topping: Stir the following together and set aside:
Preheat oven to 350F. Spray oil or butter a 9 x 13 casserole.
Slice cabbage into ¼” rounds, then cross chop into bite size lengths, and place in prepared casserole dish.
Chop onion similarly and sprinkle over the cabbage.
Drizzle melted butter on top.
Mix cream soup with a little mayo, several shakes of Worcestershire and a swirl of olive oil to make a thick but spreadable sauce. (Taste for salt)
Spoon on top of onions and cabbage and use a rubber spatula to cover all.
Top with breadcrumbs or cracker mixture and bake uncovered for 45 minutes on middle rack.
