Place a large skillet over high-heat and add some oil, once hot, sear the chicken pieces until browned.
Place the thighs in the crockpot.
Add the rest of the ingredients on top.
Cover with the lid on the slow cooker, and cook on LOW for 7-8 hours, or HIGH for 3-4 hours.
During the last 30 minutes of cooking, add the cornstarch slurry. Close the lid and let it cook for 30 more minutes.
Serve it warm over some white rice and veggies on the side.
