Unroll the puff pastry sheet and stamp out 12 ghosts using a ghost cutter.
Transfer the ghosts to a lined baking tray and brush with beaten egg.
Bake at 180°C fan for 15 minutes or until puffed up, golden and crisp. Use a knife to pierce a hole in the bottom of the pastries to release the steam. This will stop the pastries from collapsing and be used to fill the pastries with jam. Leave to cool.
Spoon the blueberry jam into a piping bag fitted with a filling nozzle. Fill each of the ghost pastries with jam.
Finely chop the Milkybar white chocolate and place into a shallow heatproof bowl. Melt it in the microwave in 10–20 second bursts, stirring well between each blast, until smooth and glossy. Tip: White chocolate burns easily, so don’t rush this step. It helps to use the heat of the bowl to melt the last few chunks of chocolate.
90 grams Milkybar White Chocolate
Spoon the melted white chocolate over the pastries, spreading it out into a ghost shape. Leave to set for 20 minutes.
Draw on the ghost's eyes and mouth using black writing icing. Dip a toothpick in pink food colouring and add two rosy cheeks. Finish with a spritz of edible silver glitter for a translucent ghost-like effect!