Preheat oven to 350 degrees. Spray a muffin tin with cooking spray and set aside. Melt the butter in a small bowl and set aside to cool slightly. In another small bowl mix cinnamon and sugar and set aside. Separate crescent roll dough into triangles. (I placed the dough on a sheet of parchment paper to make it easier to work with.) Dip a marshmallow into the melted butter and then into the sugar and cinnamon mixture. Then place onto a triangle of dough and carefully roll the marshmallow inside, making sure to seal all the edges tightly. Then roll the dough covered marshmallow in the melted butter and the cinnamon sugar mixture. Place in the muffin tin and repeat until dough is used. Bake at 350 degrees for 15 minutes. Allow to cool slightly and then "break open" the rolls before eating to reveal the "empty tomb" for Easter morning!