Prep the base: In the crockpot, stir together the broth, diced tomatoes, onion, garlic, tomato paste, chili powder, cumin, smoked paprika, oregano, salt, pepper, and chipotle (if using).
Add the chicken: Nestle the chicken into the sauce so it’s mostly submerged.
This helps it cook evenly and stay moist.
Cook low and slow: Cover and cook on Low for 4–6 hours or on High for 2.5–3.5 hours, until the chicken is cooked through and easily shreds with two forks.
Shred and season: Transfer the chicken to a cutting board and shred. Stir the shredded chicken back into the crockpot to soak up the juices. Add the lime juice and taste. Adjust salt, lime, or spice as needed.
Warm the tortillas: Toast tortillas in a dry skillet for 20–30 seconds per side, or microwave wrapped in a damp paper towel for 30–45 seconds until pliable.
Assemble: Fill tortillas with chicken.
Add cabbage or lettuce for crunch, a spoon of salsa or pico, avocado, cilantro, red onion, and a small dollop of Greek yogurt. Finish with a squeeze of lime.
Serve: Plate with extra lime wedges and any favorite sides like black beans, corn salad, or a simple slaw.