Storage: Store these cupcakes in an airtight container at room temperature for 2-3 days. Once you add the filling and ganache on top, it’s best to store them in the refrigerator. Store the filled cupcakes in the fridge for up to 4 days. Freeze the plain cupcakes and ganache seperately in airtight containers for up to 2 months. Thaw cupcakes overnight in the refrigerator. Bring to room temperature before filling and serving.