They are not only impressive looking, they are also tasty. The marshmallow fondant on the outside actually tastes like marshmallows, not not regular, mediocre tasting fondant.
These cupcakes could easily also be adapted to be Storm Troopers rather than Clone Troopers, if your Star Wars fan is more old school. Simple change the pattern on the cupcake!
Step 1: The Cupcakes
Ideally, your cupcakes should be extra tall, so use a tall cupcake pan (like this one: Wilton 6 Cup Kingsize Muffin Pan). If you don't have something like that, improvise with oven safe cups that would have a similar shape.
The cupcakes must be tall for this to work, so overfill the cups. Bake a few extra cupcakes or cake in any sort of pan, to use as cake ball mixture. Since you want smooth sides, don’t bake in muffin cups. Either grease and flour the pans very well, and/or line with strips of parchment paper (that’s what I did) to prevent sticking.