01 - Spread the chopped onion and minced garlic evenly across the bottom of the slow cooker.
02 - Place the trimmed beef chuck chunks on top of the onion and garlic bed.
03 - In a small mixing bowl, whisk together the chopped chipotle peppers, lime juice, ground cumin, dried oregano, smoked paprika, salt, black pepper, apple cider vinegar, and beef broth until well combined.
04 - Pour the seasoning mixture evenly over the beef chunks and tuck the bay leaves into the liquid.
05 - Cover the slow cooker and cook on low for 8 hours, or until the beef is fall-apart tender and shreds easily with a fork.
06 - Discard the bay leaves. Using two forks, shred the beef directly in the slow cooker and stir thoroughly to absorb all the cooking juices.
07 - Serve hot with warm tortillas, over steamed rice, in burrito bowls, or as desired. Garnish with chopped cilantro, diced onions, lime wedges, and pickled red onions for a classic presentation.