These peanut butter chocolate cupcakes are a fun and delicious dessert that is perfect for any occasion. The cupcakes are made with a rich chocolate batter and a creamy peanut butter frosting. To make the frosting, simply mix together peanut butter, butter, powdered sugar, and milk until smooth and creamy. Pipe the frosting onto the cupcakes and top with a mini peanut butter cup for an extra special treat.