The easiest method is by using a digital meat thermometer. Insert the probe into the thickest part of the breast to check the temp.Chicken is considered safe to eat when it reaches an internal temperature of 165° F. Once you get a reading of at least 162°F, it’s okay to remove it from the oven, because the meat will continue to cook as it rests.You can also slice into the baked lemon chicken breast if you don’t have a thermometer. The center should be white and opaque, and the juices should run clear. If either is noticeably pink, pop the lemon chicken back in the oven for a few more minutes before checking again.