Chocolate and peanut are an excellent combination. This is why peanut butter M&Ms are so addictive, and why this particular recipe is so tasty. The chocolate cupcakes are good, but are nothing compared to the frosting. You can even make the cupcakes themselves from a boxed mix if you so choose. After all, the frosting is the showpiece. It is made from butter, crunchy peanut butter, powdered sugar, milk, vanilla, salt and crushed peanut butter M&Ms. Tasty!
Source Java Cupcake