Another site has links to free disney recipes Click Here
but I scanned through them and didn't see a corn chowder recipe. They did have the corn soup from AKL/Boma if it is the same. Otherwise, you can try writing to WDW customer service. They will send it to you if they have it. I don't have their e-mail address anymore, but I'm sure someone else can provide it.
You can find the email address under "contact us" or something similar on disneyworld's website. I've requested a couple recipes there and gotten them. It takes a few days, but they send it to you.
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