Preheat the oven to 350F. Dissolve cornstarch in cold water and combine all ingredients, except chicken thighs in a small saucepan over low heat. Cook sauce until thickened and bubbly
Place chicken thighs in a 9 x 13 baking dish and brush with sauce on both sides
Bake for one hour, basting with the sauce every 10 minutes, and flipping them once at the 30 min mark.