Prep the slow cooker: Lightly spray the insert with cooking spray or rub a little oil to prevent sticking.
Layer the base: Pour the chicken broth into the bottom of the crockpot. This helps keep the chicken moist and prevents scorching.
Add the chicken: Place the chicken breasts (or thighs) in a single layer.
Season lightly with salt and pepper.
Mix the sauce: In a bowl, stir together salsa, taco seasoning, garlic powder, onion powder, and cumin. If using green chiles, beans, or corn, fold them in now.
Combine: Pour the salsa mixture over the chicken, making sure everything is coated.
Cook low and slow: Cover and cook on LOW for 4–6 hours or on HIGH for 2.5–3.5 hours. The chicken should be tender and easy to shred.
Shred the chicken: Transfer the chicken to a cutting board and shred with two forks.
Return it to the crockpot and toss with the sauce.
Finish with lime: Stir in lime juice for brightness. Taste and adjust salt, pepper, or seasoning as needed.
Serve: Spoon into tortillas, over rice, or on top of greens. Add your favorite toppings and enjoy.