The best way to store banana chocolate chip muffins is to keep them in a zippered bag or an airtight container at room temperature. They will keep about 5 days. To freeze, either wrap them individually in a layer of plastic wrap under a layer of aluminum foil or put them in a zippered bag with the date on it and pop them in the freezer! A frozen muffin will be defrosted by lunchtime for a delicious surprise! Easy peasy!