01 - Place the chicken breasts or thighs in the bottom of the slow cooker.
02 - Sprinkle the taco seasoning, smoked paprika, salt, and pepper evenly over the chicken.
03 - Pour the salsa and chicken broth or water over the top. Squeeze in the juice of one lime.
04 - Cover and cook on high for 4 hours, or on low for 7 hours, until the chicken is tender and easily shreds.
05 - Remove the chicken from the slow cooker and shred thoroughly using two forks.
06 - Return the shredded chicken to the slow cooker and stir well to coat it in the sauce.
07 - Warm the taco shells according to package instructions.
08 - Fill each shell with the shredded chicken, then add lettuce, cheese, sour cream, tomatoes, red onion, avocado, cilantro, and a squeeze of lime as desired. Serve immediately.