This is one of those recipes that is perfect for pre-cooked rotisserie chicken from your local market. If not available, then just cook two chicken breast until done and shred them. Boiling them is fine. Sous-vide is also a good option.
Cut the chicken across the grain and then shred it.
Add the chicken to a non-stick fry pan over medium heat. Add about a cup of salsa verde to the shredded chicken and stir. Don't be stingy with the salsa. The chicken will absorb a lot.
Heat up the tortillas. I like to heat them on a non-stick griddle over medium heat for about two minutes per side. Alternatively, just make fresh tortillas. They are much better and easy to make.
Scoop some chicken into a tortilla and top with jack cheese. Sprinkle with chopped onions and cilantro and serve with lime wedges.