Reheat leftover sour cream enchilada sauce on the stovetop over low heat, making sure to stir it every few minutes. A lid helps speed things up. You can also microwave the sauce if you want it heated more quickly, but I recommend doing so in 30 second intervals. You’ll want to stir the sauce after each 30-second intervals. The cautious approach is best here to preserve the creamy consistency when heating up dairy in the microwave.