I just found this and it looks tasty, but I have not tried it:
http://allrecipes.com/recipe/chocola...iv/detail.aspx
This one seems a little less appealing because of the tomato soup (?!) in it, but people liked it well enough to give it 5 stars:
http://allrecipes.com/recipe/brown-s...ke/detail.aspx
Thanks for inspiring me to look!