The optimal temperature for cooking chicken is 165 degrees Fahrenheit. This temperature will ensure that the chicken is cooked all the way through and is safe to eat. However, chicken can be cooked at lower temperatures as well. If you are cooking chicken at a lower temperature, you will need to cook it for a longer period of time in order to ensure that it is cooked all the way through. The best way to know if chicken is cooked through is to use a meat thermometer.