Place the chicken breasts at the bottom of the slow cooker. Sprinkle with salt, pepper, cumin, oregano, chili powder, and cayenne.
Add the diced onion, minced garlic, beans, green chiles, corn, chicken broth, and chopped cilantro. Stir everything together to combine.
Cover and cook on LOW for 8 hours or HIGH for 3–4 hours, until the chicken is fully cooked and tender.
Remove the chicken, shred it with two forks, and return it to the slow cooker.
Add the softened cream cheese and half and half. Stir well, cover, and cook on HIGH for 15 minutes more, until creamy and slightly thickened.
Tip: For a smoother texture, whisk the cream cheese with a few ladles of hot chili before stirring it into the slow cooker.
Serve hot with desired toppings.