Preheat oven to 350F.
Prepare your muffin tin, mold or cups with nonstick cooking spray.
Roll out each sheet of crescent roll dough until you have 3 rectangles and the perforation lines are sealed.
spread equal amounts of melted butter on each sheet.
combine the cinnamon and sugar in a small bowl & sprinkle on each sheet.
Cut the dough in half & then cut lengthwise. Each crescent dough log will make 4 muffins.
Wrap each piece of dough around your finger, making a muffin shape. Then place them into the prepared mold.
Bake for 20-22 minutes of until golden brown.
Allow the cruffins to cool for a few minutes before filling. Scoop the Nutella spread into a piping bag or ziplock bag with the tip cut off. Squeeze the Nutella into one of the dough folds, filling the Cruffin with about a tablespoon each. Top with a chunk of chocolate & enjoy!