I just got the Superman Cricut cartridge in my mail a few days ago and saw that it made these really cute cupcake holders. Since I am working on a custom Superhero order I thought they would be perfect for her son's party.
To cut the cupcake holder I decided to try it at "fit to page" on a 12x12 mat and it was perfect!! Now when you cut out the building and details make sure you turn off the fit to page feature and cut those out at 11 1/4" (same as the holder). This will fit perfectly.
If you have any questions on creating this cupcake holder using the Superman Cricut Cartridge please feel free to contact me.