01 - Scatter the chopped onion and minced garlic evenly across the bottom of the slow cooker.
02 - Arrange the beef chuck chunks on top of the onion and garlic layer.
03 - In a small mixing bowl, combine the chopped chipotle peppers, lime juice, ground cumin, dried oregano, smoked paprika, salt, black pepper, apple cider vinegar, and beef broth. Stir until well blended.
04 - Pour the seasoning mixture evenly over the beef. Tuck the bay leaves into the liquid around the meat. Cover with the lid and cook on low for 8 hours, or until the beef is fork-tender and shreds easily.
05 - Discard the bay leaves. Using two forks, shred the beef directly in the slow cooker, mixing it thoroughly with the accumulated juices to absorb all the flavor.
06 - Serve hot with warm tortillas, over steamed rice, in burritos, or in bowls with your choice of toppings.