The most reliable way to determine if chicken tenders are fully cooked is to use a meat thermometer to check the internal temperature. The FDA recommends that chicken should be cooked to an internal temperature of at least 165°F (74°C). Insert the thermometer into the thickest part of the chicken tender and make sure it reaches at least 165°F. If you don't have a meat thermometer, you can also check the color of the chicken. Fully cooked chicken should have a white, opaque color throughout. If the chicken is still pink or translucent in the middle, it needs more time to cook.