I'd check Mimi's or Millies websites and see if they offer cupcakes. I know personally that Mimi's muffins are heavenly. The 7-11 on the corner of Katella and S. Harbor Blvd would have something along the lines of what you are looking for, but it's an additional 10 mins walk from DL to it, so I'm not sure that it's worth it. I'd also check the other hotels gift stores to see if they've got anything.