How to Store or Make Mini Cupcakes Ahead of Time
Once your cupcakes have cooled completely you can place them in an airtight container for four to five days. Make sure the lid on the container does not touch the top of your mini cupcakes. If they do or you do not have a lid, you can use plastic wrap to contain them.
If you know you are storing your cupcakes, leave off your frosting until you are ready to serve. You can store your frosting in a ziplock bag or airtight container in the refrigerator for five to seven days as well.