Add the bay leaf, stock, onion soup, red wine, pepper and garlic powder.
Cook on low 8-10 hours or until the beef is completely tender and falls apart. Remove to a cutting board and chop or pull. Return the meat to the slow cooker.
Discard the bay leaf.
Brown the rolls and slather with the mayonnaise. Don't be shy with it, you might need more.
Spoon the meat onto the rolls and top with the cheese.
Ladle the juices from the slow cooker into bowls for dipping.