If you use chicken thighs instead of breasts, start checking for doneness around 3 hours to prevent drying out., For a milder dish, use mild salsa and reduce taco seasoning; to increase heat, use spicy salsa or add chili powder or jalapeños before cooking., Stir in sour cream off the heat to avoid curdling; plain Greek yogurt can be substituted but avoid boiling after adding it., Leftovers can be stored in an airtight container in the refrigerator for up to one week or frozen for longer storage., When reheating, add a splash of salsa and sour cream to refresh the flavors and moisture., A stand mixer on low speed can quickly shred large quantities of chicken in 20-30 seconds, preserving moisture by mixing in some cooking juices.