Mix sauce ingredients together in a small bowl. Set aside
Heat olive oil over medium heat in a large frying pan. Season the Chicken thighs with salt and pepper and put it in the pan to sear. Cook each side for 4 mins or until browned. ( the inside of the chicken doesn’t need to cook as the slow cooker will cook it later on).
Put the chicken thighs and sauce into a slow cooker and cook for 3 hours on high (no more than 5 hours or it will break apart too much)