Transfer the mixture into a 5- to 8-quart slow cooker. Generously season the chicken thighs with salt and add them to the pot. Stir in 3 cups chicken stock and the beans. Cover and cook on low until the chicken is tender, 4 to 6 hours. Shred the chicken using two forks. Preparation. Generously coat the interior of a 6- to 8-quart slow cooker with nonstick cooking spray or vegetable oil. In a large liquid measuring cup or bowl, whisk together the milk, sour cream, eggs, butter and oil until uniformly combined.