I love experimenting and making new cakes. The friend I made this for really gave me free range of whatever I wanted to do. Her husband loved Reese's Peanut Butter Cups, so for his birthday I made a 10" square chocolate cake with peanut butter frosting. After experimenting for awhile, I came up with a great peanut butter frosting. Chocolate cake with this peanut butter frosting maybe one of my new favorites!