Prep the base: Add onion, garlic, black beans, diced tomatoes, green chiles, corn, and any optional veggies to the slow cooker.
Season: Stir in chili powder, cumin, smoked paprika, oregano, salt, and pepper. Pour in chicken broth and mix well.
Add the chicken: Nestle the chicken breasts or thighs into the liquid so they’re mostly submerged.
Slow cook: Cover and cook on Low for 6–7 hours or High for 3–4 hours, until the chicken is very tender.
Shred the chicken: Transfer chicken to a cutting board and shred with two forks.
Return it to the slow cooker and stir.
Brighten: Stir in the lime juice and taste. Adjust salt, pepper, or spices as needed.
Serve: Ladle into bowls and top with cilantro and your favorite toppings. Add lime wedges on the side.