Trim your chicken breasts, sprinkle with salt & pepper and place them in your slow cooker. In a medium bowl, add the honey, soy sauce, ketchup, oil, garlic, onion and red pepper flakes. Stir well to combine. Pour over the chicken in the slow cooker. Cover and cook on LOW for 3-4 hours or HIGH for 1½ to 2½ hours. When done, remove chicken from crock pot and cut into chunks.