Follow these steps to reheat maggiano's chicken parmesan. Place the frozen chicken parmesan in a microwaveable container. It should be heated for 2 minutes on high power. Turn it upside down and heat for 2 more minutes. Check the temperature of the chicken Parmesan after 2 minutes. If it is still not hot, heat it for another minute. If it isn't hot enough, heat it again for 1 minute.