I was so weirded out at the idea of chocolate and peanut butter in chili...Reese’s Peanut Butter Chili cups- that I had to look up to see how widespread this taste is on the internet.
Found one that adds hominy and pumpkin puree that has good reviews
http://www.peanutbutterboy.com/super-peanut-butter-chili-bowl/
if you like peanut butter chocolate chili...you might like the cake
Peanut Butter Glazed Chocolate-Chili Cake
http://bakarlivetsotare.blogspot.com/2012/11/peanut-butter-glazed-chocolate-chili.html