Layer the base: Add sliced onion to the bottom of your slow cooker. This keeps the chicken elevated and infuses mild sweetness.
Add the chicken: Place chicken breasts (or thighs) on top of the onions in a single layer if possible.
Season well: Sprinkle cumin, chili powder, salt, and black pepper over the chicken. Add the minced garlic.
Pour in salsa verde: Cover the chicken with the salsa.
If you like a looser sauce, add the chicken broth now.
Cook low and slow: Cover and cook on Low for 4–6 hours or High for 2.5–3.5 hours, until the chicken easily shreds with two forks.
Shred the chicken: Transfer the chicken to a cutting board and shred. Return it to the slow cooker and toss in the juices.
Brighten it up: Stir in the lime juice and a handful of chopped cilantro. Taste and adjust salt as needed.
Serve your way: Spoon into warm tortillas, over rice or cauliflower rice, or pile onto a salad or nachos.
Add toppings like avocado, cotija, pickled red onions, or extra cilantro.