Hey, Trish!
I did a search for peanut butter cups and found a recipe and beautiful pictorial tutorial that Mama posted for Peanut Butter Balls. http://www.netcookingtalk.com/forums/showthread.php?t=2118&highlight=peanut+butter+cups
I'd never seen that post before!
Looks like something close to what you want, only not in cups.
Lee