In a large bowl, whisk together oil, garlic, broth and vinegar.
Place thighs in bottom of a large crock cooker, pour the mixture over chicken, season with salt and pepper, make sure it’s fully saturated, then cook on HIGH for 3 to 4 hours or LOW for 7 to 8 hours. Shred chicken with forks once done and put aside half of chicken for the next day’s lunch (Shredded Chicken with Wilted Garlic Spinach).