How long does the beef need to cook?
The chuck roast typically needs 6–8 hours on low or 3–4 hours on high in a slow cooker until very tender and shred-ready.
Can I use a different cut of beef?
Yes. Brisket, short ribs, or pork shoulder work well; adjust cooking time based on thickness and fat content.
What's the best way to crisp the tortillas?
Fry corn tortillas briefly in hot vegetable oil until golden and crispy, or bake them at 375°F for 8–10 minutes until firm.
Can I make the beef ahead?
Yes. Cook the beef up to 2 days ahead, cool, refrigerate, and reheat gently in a skillet or slow cooker before serving.
How do I adjust heat level?
Reduce or remove chipotle peppers and dried chiles for milder; add fresh serrano or jalapeños for extra heat.