Prep the base: Rinse and cook your rice or quinoa according to package instructions. Fluff and keep warm, or make it earlier and reheat later.
Layer the crockpot: Add sliced onion and minced garlic to the bottom of the slow cooker.
Place chicken on top.
Season well: Sprinkle cumin, oregano, salt, and pepper over the chicken. Pour salsa verde over everything. If using, add green chiles.
Cook low and slow: Cover and cook on Low for 4–6 hours, or on High for 2.5–3.5 hours.
The chicken should be tender and easy to shred.
Shred the chicken: Transfer chicken to a plate and shred with two forks. Return it to the crockpot and stir into the sauce.
Brighten the flavor: Squeeze in fresh lime juice and taste. Adjust salt and pepper as needed.
Warm the add-ins: If using beans or corn, stir them into the crockpot in the last 15 minutes to heat through, or warm them separately.
Assemble your bowls: Add a scoop of rice (or greens) to each bowl.
Top with a generous portion of salsa verde chicken.
Finish with toppings: Add cilantro, avocado, cheese, pickled onions, jalapeños, and a dollop of yogurt or sour cream. Serve with lime wedges.
Make it a meal: Pair with a simple side salad, warm tortillas, or tortilla chips for crunch.