I started with a yellow cake mix, follow the directions on the box. Fill your cupcake papers half way full, add a Reese cup and top with more batter, the paper should be 3/4 full now.
Bake at 350* for 20 min. Let your cupcakes cool completely and ice.
I used a can of chocolate frosting for 12 of them and made peanut butter frosting for the other 12. I put the remaining frosting in the microwave for 30 seconds and drizzled chocolate on the cupcakes with peanut butter frosting and drizzled peanut butter over the cupcakes with chocolate frosting.