Arrange the chicken breasts on the bottom of the slow cooker.
Sprinkle taco seasoning over the chicken.
Pour in tomato sauce and green chiles.
Flip the chicken a couple times to make sure the ingredients are blended and chicken is coated.
Cook on low for 4-6 hours.
Using two forks, shred the chicken in the slow cooker If you want less of the sauce then remove the chicken from the slow cooker and place it into a bowl. Shredded the chicken and ladel in the desired amount of liquid into the shredded chicken.
Squeeze half of the lime juice in with the shredded chicken. Give it a taste and add more if needed.
Place about 1/4 cup of shredded chicken in to a taco shell and top chopped avocado, greek yogurt, lettuce, and taco cheese.