Preheat oven to 350°F. Prepare muffin pans with baking cups.
In large bowl, prepare cake mix according to package directions. Fill baking cups 2/3 full with cake batter.
Bake 18-20 minutes or until toothpick inserted in center of cupcake comes out clean. Cool cupcakes in pan on cooling grid 5 minutes. Remove from pan; cool completely.
In small bowl, melt Marshmallow Candy Melts Candy according to package instructions. Heat cream until warm but not hot. Whisk into melted candy. Cool until just slightly warm. Prepare a decorating bag with tip 230 and fill with cooled marshmallow candy mixture; insert tip in top center of cupcake and squeeze until cupcake expand slightly. Ice as desired with buttercream icing; top with icing decoration.
Another very easy way to construct a tier cake. The Wilton Basic Tall Tier Cake Stand Set includes 5 twist-apart columns with one bottom and one top bolt, an 18 in. footed base plate, 8, 10, 12, 14 and 16 in. separator plates.