Place the chicken thighs into your slow cooker along with the salsa verde, chopped green chiles, garlic, jalapeño, garlic powder, onion powder, and cumin. Stir everything together gently so the chicken gets fully coated in the seasoned sauce. This step sets the flavor foundation for the entire dish.
Cover the slow cooker and cook on low for 6 to 8 hours, or on high for 3 to 4 hours if you're short on time. The chicken is done when it's tender enough to pull apart easily with a fork. Resist the urge to lift the lid too often, since it lets heat escape and slows down cooking.
Once the chicken is fully cooked, remove it from the slow cooker and place it on a cutting board. Use two forks to shred it into bite-sized pieces, or save time by using a hand mixer on low speed. Either method works well and takes just a minute or two.
Add the shredded chicken back into the slow cooker with the sauce and stir well so every piece soaks up that tangy, savory flavor. This is where the dish really comes together, turning simple shredded chicken into something deeply flavorful. Let it sit for a few minutes so the flavors meld.
Stir in the sliced scallions and chopped cilantro right before serving to keep their flavor bright and fresh. Season with kosher salt to taste, then finish with a good squeeze of fresh lime juice. This final touch is what makes the dish taste vibrant rather than heavy.