Place chicken breast, onion, garlic, salt, cumin, pepper, and chopped green chiles in the slow cooker.
2
Stir to coat chicken breasts with the spices.
3
Pour chicken broth over the chicken and spices, ensuring the chicken is fully submerged.
4
Cook on high for 4 hours or low for 6 hours.
5
About 30 minutes before the end of cooking time, remove the lid and shred the chicken into bite-size pieces using two forks.
6
Add the great Northern beans and cannellini beans to the slow cooker and stir well. Return the lid to the slow cooker and continue cooking for the remaining 30 minutes.
7
Turn off the slow cooker and remove the lid. Stir in the sour cream until fully incorporated.
8
Serve the chili hot, and optionally, top with shredded cheddar cheese, fresh cilantro, green onions or avocado.