01 - Place chicken breasts in the bottom of a slow cooker.
02 - Sprinkle ranch seasoning mix, garlic powder, onion powder, smoked paprika, and black pepper evenly over the chicken.
03 - Pour chicken broth and diced tomatoes with green chilies along with their juices over the seasoned chicken.
04 - Cover and cook on low for 4-5 hours or on high for 2-3 hours, until chicken is tender and reaches an internal temperature of 165°F.
05 - Remove chicken from the slow cooker and shred using two forks. Return shredded chicken to the pot, stir to combine with the juices, and let rest for 10 minutes to absorb the flavors.
06 - Warm taco shells or tortillas in a dry skillet or oven until pliable.
07 - Divide the ranch chicken among the warmed taco shells and top with shredded lettuce, cheddar cheese, sour cream, diced tomatoes, and fresh cilantro as desired. Serve immediately.