01 -
In a big pan on medium heat, toss the beef and onions together, breaking up the meat until it's fully browned and there’s no pink left.
02 -
Pour out any extra fat left in the pan to make sure your sandwiches won't taste too oily.
03 -
Put the beef and onion mixture into the slow cooker, spreading it in an even layer at the base.
04 -
Combine the beef mix with oats, beef stock, seasoning packet, Worcestershire, garlic powder, and black pepper. Stir it thoroughly until blended.
05 -
Cover with the lid and let it cook on low for around 3-4 hours. This will thicken the mix and bring all the flavors together.
06 -
Right before serving (15-20 min), layer the provolone cheese on top, close the lid, and wait for it to melt.
07 -
Toast your buns lightly while waiting for the cheese to melt. This keeps the bread from getting soggy.
08 -
Scoop a generous amount of the beef and cheese onto the bun's bottom half. Top with the other half and serve with some of the leftover juices for dipping.