First, we’re going to warn you against using the microwave. Sure, it’s fast but it’s just not worth it. Here’s our suggestion—take the chicken out of the oven and let it come to room temperature while the oven preheats to 400℉. Place it on a wire rack on a cookie sheet. When the oven comes to temperature, slide the chicken into the oven and give it 15 minutes, until it’s warmed through and the skin is crispy.