Place the chicken breasts into the bottom of a large crockpot.
Sprinkle the cumin, oregano, salt, pepper, cayenne, and chili powder over the chicken.
Add the diced onion, minced garlic, drained beans, green chiles, and drained corn on top of the chicken.
Pour in the chicken broth, ensuring all ingredients are submerged.
Cover and cook on low for 6-8 hours, or on high for 3-4 hours.
About 30 minutes before the cooking time is up, remove the chicken from the crockpot and shred it using two forks.
Return the shredded chicken to the crockpot and stir in the sour cream until fully combined.
Continue cooking for the remaining 30 minutes to allow the flavors to meld together.
Serve the white chicken chili hot with your favorite toppings like cilantro, Monterey Jack cheese, Santa Fe tortilla strips, and a squeeze of fresh lime.