Freeze 3 Musketeers Minis for 1 hour.

Preheat the oven to 350F degrees. Line cupcake pan with cupcake liners. Set aside.

Make chocolate cake batter per boxed cake mix instructions.*

Scoop batter into cupcake liners, no more than ½ full. Press a 3 Musketeers Minis down slightly into the batter, spoon a little batter on top of candy bar so that it is no longer visible.

Bake cupcakes as directed on the back of the boxed cake mix. Remove cupcakes from oven and allow cupcakes to cool in cupcake pan for 3 minutes; transfer to wire rack and cool completely. Cupcakes should be cooled completely before frosting.

In a large bowl using an electric mixer, cream butter and shortening until creamy and smooth. Add cocoa powder, vanilla extract, and salt; mix until combined.

Slowly add powdered sugar 1 cup at a time; beating well after each addition. Scrape down bowl as necessary.

Once all powdered sugar has been mixed in, add 1 tablespoon of milk at a time and mix. Continue to add and mix until desired consistency is achieved.

Frost using a decorating tip or spatula onto cooled cupcakes. Eat & Enjoy!