You can reheat the chicken in a microwave, but do so using the reduced-power mode. This will slowly bring the chicken to temp. If you just zap it at regular power, you will dry out your chicken. Instead, place the chicken breast on a plate, add a teaspoon of water to the plate. Cover with a damp paper towel and reheat in 30-second intervals at 50% power, until it’s warmed through. To reheat the chicken on the stove, slice the chicken and add it to a skillet with a splash of chicken broth or pat of butter.