Whisk all of the ingredients together in a small bowl before adding the sauce to the pan with the cooked chicken. Depending on how much chicken you're making, you may only need about half of the sauce.
If you'd like a thicker sauce, stir together 1 tablespoon cornstarch and 1–2 tablespoons cold water to make a slurry, then whisk it into the simmering sauce until it reaches your desired consistency.