Bake cupcakes according to directions on package and let them cool completely.
With end of round handle of wooden spoon or small knife, make an indentation in the center of each cupcake, not quite to the bottom (wiggle end of spoon in cupcake to make opening large enough).
In a small bowl, mix 1 cup of vanilla frosting and the 1/2 cup marshmallow creme. Spoon into small plastic bag. Cut the tip off 1 bottom corner of bag. Insert tip of bag into each cupcake and squeeze bag to fill.
In small microwavable bowl, microwave chocolate frosting, chocolate chips and corn syrup uncovered on High 30 seconds; stir. Microwave 15 to 30 seconds longer; stir until smooth. Dip top of each cupcake in frosting. Let stand until frosting is set.
Spoon 3 tablespoons vanilla frosting into small plastic bag. Cut tiny tip off the bottom corner and pipe loops on each cupcake.