01 - In a small bowl, combine ground cumin, dried oregano, smoked paprika, sea salt, black pepper, and cinnamon. Mix thoroughly until evenly incorporated.
02 - Place the beef chuck chunks into the slow cooker. Sprinkle the spice blend over the meat and toss until all pieces are evenly coated.
03 - Add the chopped onion, minced garlic, chopped chipotle peppers, and jalapeño to the slow cooker, distributing them around and over the seasoned beef.
04 - In a separate bowl, whisk together the fresh lime juice, apple cider vinegar, beef broth, and tomato paste until smooth. Pour the mixture evenly over the beef and vegetables in the slow cooker.
05 - Tuck the bay leaves into the liquid. Cover the slow cooker and cook on LOW for 8 hours, or until the beef is fork-tender and shreds apart effortlessly.
06 - Remove and discard the bay leaves. Using two forks, shred the beef directly in the slow cooker, mixing it thoroughly with the accumulated cooking juices.
07 - Serve hot in warm corn or flour tortillas for tacos, wrapped in burritos, or ladled over rice bowls. Garnish with fresh cilantro, diced onion, and lime wedges as desired.