Preheat oven to 375 degrees F.
Lay the crescent roll triangles on a parchment lined baking sheet.
In a small bowl, mix together the cinnamon and sugar.
Dip a marshmallow into the butter and then into the cinnamon sugar mixture, coating it thoroughly.
Place a marshmallow on a crescent roll triangle and roll it up. Pinch all of the seams shut so the marshmallow is completely enclosed.
Bake for 9-10 minutes.
Remove from the oven and then open it up to see that it is empty!