Prep the base: Add onion, garlic, bell pepper, diced tomatoes, tomatoes with green chiles, black beans, corn, chicken broth, and tomato paste to the crock pot. Stir to combine.
Season: Sprinkle in chili powder, cumin, smoked paprika, oregano, salt, and pepper. Stir well so the spices are evenly distributed.
Add chicken: Nestle the chicken breasts or thighs into the mixture, making sure they’re mostly submerged.
Cook: Cover and cook on Low for 6–7 hours or High for 3–4 hours, until the chicken is fully cooked and tender.
Shred the chicken: Remove the chicken to a cutting board and shred with two forks.
Return the shredded chicken to the crock pot.
Finish and balance: Stir in lime juice and cilantro. Taste and adjust salt, pepper, and chili powder as needed for brightness and heat.
Serve: Ladle into bowls and top with tortilla strips or chips, avocado, cheese, sour cream, jalapeños, and extra cilantro. Add a lime wedge on the side.