Season boneless chuck roast with salt and pepper. Heat oil in a large skillet over medium-high heat, sear the beef on all sides for 5-7 minutes.
Transfer beef to slow cooker, add onion, garlic, guajillo chiles, chipotle chiles, beef stock, tomato paste, diced tomatoes, apple cider vinegar, cumin, oregano, cinnamon stick, and bay leaves. Cover and cook on low for 8 hours or high for 5-6 hours.
Remove beef, let it rest, then shred into bite-sized pieces. Discard cinnamon stick and bay leaves.
Blend consome in the slow cooker until smooth to create a luxurious consome.
Mix some consome with shredded beef, set aside the rest for dipping.
Assemble tacos by dipping tortillas in warm consome, fill with beef, onion, cilantro, and cheese, then fry until golden brown.