Load the base: Add onion, garlic, enchilada sauce, chicken broth, diced tomatoes, black beans, corn, and green chiles to your slow cooker. Stir in chili powder, cumin, smoked paprika, oregano, and a light pinch of salt and pepper.
Nestle in the chicken: Place the chicken breasts (or thighs) into the mixture, making sure they’re submerged.
Cook low and slow: Cover and cook on Low for 6–7 hours or High for 3–4 hours, until the chicken is fork-tender.
Shred the chicken: Transfer the chicken to a cutting board, shred with two forks, and return it to the crockpot.
Stir well.
Thicken (optional): If you want a slightly thicker, more “enchilada-like” texture, stir in the masa slurry. Cook uncovered on High for 10–15 minutes until the soup lightly thickens.
Brighten it up: Stir in lime juice and cilantro. Taste and adjust salt and pepper as needed.
Top and serve: Ladle into bowls and add your favorite toppings.
Serve with warm tortillas or cornbread if you like.