Prepare the Chicken:
Place the chicken breasts into the slow cooker. Season them with taco seasoning, cumin, garlic powder, chili powder, salt, and pepper. Pour the salsa and chicken broth (or water) over the top.
Cook:
Cover the slow cooker and set it to cook on low for 6–7 hours or on high for 3–4 hours. The chicken should be tender and easily shred with a fork.
Shred the Chicken:
Once the chicken is fully cooked, remove it from the slow cooker and shred it using two forks. Return the shredded chicken to the slow cooker, mixing it with the juices for extra flavor. Taste and adjust seasoning if needed.
Serve:
Warm your taco shells according to package instructions. Fill each shell with the shredded chicken and top with your favorite taco toppings such as lettuce, tomatoes, cheese, sour cream, avocado, cilantro, and a squeeze of lime.