Pop Popcorn in microwave and set aside.
Melt the marshmallows and butter in a small pot over the stove, stirring frequently.
Once the marshmallows and butter are about melted all the way, drop several drops of black gel food coloring to get the color to your liking for the Death Star.
Once melted and mixed, pour the mix over the popcorn on a baking sheet.
I buttered up my hands (this is key) and molded my popcorn balls (Death Stars).
You can set them aside or stick them in the fridge to get them to harden up before eating.