Roll a sheet of puff pastry and cover generously with Nutella. Cover with puff pastry sheet and roll again. Bake at dust with powdered sugar.
Try printing this on paper and making a small box. Could use recipient's name, age, occasion, what ever! - - - advent calendar DIY - (This is in German but pretty self-explanatory.
Level Up: 20 Booster für dein Selbstbewusstsein [Infografik] - Mind Hack