01 - Place the chicken breasts or thighs in the bottom of the slow cooker, arranging in an even layer.
02 - Sprinkle the taco seasoning, smoked paprika, salt, and black pepper evenly over the chicken pieces.
03 - Pour the salsa and chicken broth (or water) over the seasoned chicken. Squeeze fresh lime juice directly into the slow cooker.
04 - Cover and cook on high setting for 4 hours, or on low setting for 7 hours, until chicken reaches internal temperature of 165°F and shreds easily.
05 - Remove cooked chicken from the slow cooker and shred thoroughly using two forks, pulling meat apart into bite-sized pieces.
06 - Return shredded chicken to the slow cooker and stir well to coat evenly in the cooking liquids, allowing to absorb flavors for 5-10 minutes.
07 - Warm taco shells according to package instructions, either in oven, microwave, or dry skillet until pliable and heated through.
08 - Fill each warmed shell with shredded chicken, then layer with lettuce, cheese, sour cream, diced tomatoes, red onion, sliced avocado, and cilantro. Serve immediately with fresh lime wedges for squeezing.