The best and most foolproof method is to check the chicken for doneness by using a digital instant-read thermometer. Insert the thermometer into the side of the chicken at the thickest area. Make sure that the tip of the thermometer reaches the center of the chicken for the best reading. The chicken is done when the thermometer reaches 160º F to 165º F. Additionally, the juices of the chicken should run clear when the chicken is pricked with a sharp knife or when the thermometer is removed.