Put the chicken breasts in a slow cooker and top with the salsa verde, honey, lime juice, and seasoning.
Cover and cook in high for 4 to 5 hours or on low for 8 hours or until the meat separates easily with a fork.
Transfer the chicken breasts to a cutting board and use 2 forks to shred the meat. Return the shredded meat to the slow cooker, cover, and cook for an additional 30 minutes to allow the meat to absorb the sauce and seasonings.
Tip: Pre-heat your oven to 350F. Place the taco shells on a sheet pan and bake them for 5 minutes to get the best crunchy texture.
Using tongs, transfer the chicken to a serving platter, leaving the excess liquid in the slow cooker.
Assemble the tacos:
Stuff each taco shell with the chicken and top with cheese, lettuce, pico de gallo, and avocado.