The mini cakes are only at the GF.
CRT now has the Cinderella Slipper dessert added to their menu for the 50th Anniversary celebration. That's all I can think of besides calling the cake number to order a cake. When you call to make ADRs they give you a phone number if you wish to order a cake for birthdays or anniversaries but they are not the GF mini cakes. Here's the phone number: #407-824-7091
Here's a picture of the one I had at GF; CRT's is a little different in that it comes with some fruit and it on top of some angel food cake: