For each pouch, paint two squares with the melted butter and place one on top of the other, buttered side up, pressing firmly one onto the other with the top square at a quarter turn to have a star shape with 8 corners.
Place a spoonful of chocolate in the middle and generously sprinkle with cinnamon.
Take the dough carefully in your hand and pinch opposite corners together until they stick and form a pouch.
Place a baking tray lined with a parchment paper or a silicone mat.
Repeat for the remaining chocolate and phyllo dough.
Beat the egg in a small bowl and paint all the pouches with the egg wash.