Store leftover marshmallow creme in an airtight container in the fridge for up to one monthWhen using peppermint extract, remember less is more. Too much extract will leave your fudge tasting like toothpaste.Be sure to use Peppermint extract rather than Mint or SpearmintFudge should be stored in an airtight container with parchment or wax paper between the layers. Store in the fridge for up to one weekFudge may be frozen for up to 3 months, storing in an airtight container similarly to how you would store it in the fridge. Thaw at room temperature at least 2 hours before serving