Most microwave popcorn devotees are more focused on the time they leave their bag inside for, but there is another way to avoid un-popped popcorn. A small sentence on the back of most packages reads: “For best results, preheat the microwave oven by heating a cup of water for one minute on high. Remove the cup of water before popping corn."
By following this important step, the microwave will be warm before you begin, ensuring the popcorn will come out nice and fluffy once you cook it.
**FYI: There are other “popping hints” on the back of the bag worth noting.