The best way to freeze muffins (so that they don’t freeze together) is to first pop them in the freezer on a parchment-lined sheet pan for 3-4 hours, and then transfer them to a freezer-friendly gallon bag to store in the freezer until you’re ready to enjoy. To reheat from frozen, just microwave your muffin for 1-2 minutes (start with 1 minute, and continue microwaving in 30-second increments until heated through if needed).