Place the chicken thighs in the crock pot. Sprinkle the taco seasoning evenly over the chicken.
Add the chicken broth, chopped onion, minced garlic, and diced tomatoes with green chilies to the crock pot. Stir to combine.
Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is tender and easily shredded.
Once cooked, shred the chicken using two forks and stir it back into the sauce. Add lime juice and mix well.
Warm the corn tortillas in a skillet or microwave.
Assemble the tacos by placing a generous amount of the shredded chicken mixture on each tortilla.
Top with your choice of cilantro, avocado, cheese, sour cream, and a squeeze of lime juice.