You could try contacting WDW guest services to see if they have a recipe.
The Disboards has a forum near the bottom of the Forum list called Creative Community that has a Cooking subforum. The index link no longer works, but if you have a plenty of time there are a lot of recipes.
There are other websites that have recipes, such as allears, the Disney Food blog, D23, Family Fun magazine come to mind. Googling brings up many original and copycat recipes.
There are many Disney cookbooks, both official ones published by Disney and unofficial ones. Your library might have some.