Toast dried chilies lightly, then soak in hot water until softened
Blend chilies with tomatoes, garlic, spices, vinegar, and broth into a smooth sauce
Season beef with salt and pepper
Place beef in slow cooker and pour sauce over it
Add onion and bay leaves
Cook on low for 8–10 hours until meat is tender and shreddable
Remove beef and shred with forks
Strain or blend remaining liquid into a smooth consommé
Return shredded beef to the sauce and mix well
Dip tortillas into the consommé
Place tortillas in a skillet with a little oil
Add cheese, beef, onion, and cilantro
Fold and cook until crispy on both sides
Serve hot with consommé for dipping