Mix up cake mix according to directions on package filling 18 paper cups instead of 24.
Bake at 400 degrees Fahrenheit for 11 to 13 minutes. This creates tall peaks so you don't use as much frosting.
Prepare marshmallow frosting by beating the butter and powdered sugar with an electric hand mixer, it will be crumbly. Add half the marshmallow creme and vanilla extract. Beat again. Then add the remaining marshmallow creme and beat until combined. Scoop frosting into a piping bag fit with a round tip.
ASSEMBLING THE CUPCAKES: Pipe some marshmallow buttercream on top of the cupcakes with a round tip. This frosting is kind of soft and will droop down the longer it sits on the cupcake, which is okay, just FYI.
Squeeze two black dots one of the flat ends of a large marshmallow. Repeat for each cupcake (18). With a toothpick, drag some of the black gel of one dot towards the other dot to create a line between the two eyes. Allow the gel to sit and dry slightly for a few minutes.
Using another marshmallow, make two cuts from the bottom corners to the top middle, creating 3 triangles. You will use the outer triangles for arms. The fat ends will be the shoulders. Discard or eat the middle triangle piece. Repeat for 18 cupcakes.
Set the head on the top center of the frosting, and one marshmallow arm on each side of the head with the cut/sticky part touching the frosting and the fat end up by the head for shoulders. Repeat with each cupcake.