Spread bread in 2 large( 9x13)buttered casseroles, drizzle with butter, sprinkle with meats & cheeses, not parmesan.Beat together milk, eggs, wine, onion, mustard & spices until foamy. Pour over casseroles, Cover with foil, crimping edges. Refrigerate overnight.
Remove from fridge & let stand for 30 minutes. Preheat oven to 325@, baked covered about 1 hour. uncover, spread sour cream & parmesan over all. Bake until crisply & lightly browned- about 10 minutes.