Lightly grease the interior of your slow cooker with a small amount of oil or nonstick spray. Place the chicken in the bottom of the pot.
In a bowl, mix the taco seasoning, salsa, and chicken broth. Add the chopped onion and minced garlic, then stir in the lime juice. Pour over the chicken.
Cover and cook on low for 6–7 hours or on high for 3–4 hours, until the chicken is tender and shreds easily.
Carefully remove the chicken to a cutting board. Use two forks to shred it, then return it to the slow cooker and stir to coat with the sauce.
If you want a thicker filling, simmer uncovered on high for 15–20 minutes more, stirring occasionally to reduce excess liquid.
Warm the tortillas in a dry skillet, microwave, or in the oven wrapped in foil. Layer with shredded chicken, cheese so it melts, cilantro, pico de gallo, avocado, and a dollop of sour cream if you like.
Serve immediately with lime wedges on the side for a fresh squeeze before eating. Enjoy the hands-off convenience and bold flavors.
Tips: If you prefer a lighter version, skip the cheese and sour cream or use a lighter cheese substitute. The filling can also be used to make burritos, bowls, or a quick taco salad.