There are many delicious ways to use onion soup mix besides making soup, and it's worth experimenting with it as a dry rub for standing rib roast, brisket, Salisbury steak, and succulent French ...
Meanwhile make the croutons ... the beef stock in this French onion soup could be substituted for mushroom stock. If you don't have Madeira, you can use dry sherry, white vermouth or just leave ...