Preheat the oven to 200c and line a baking tray with greaseproof paper.
Roll out the shortcrust pastry into a large square then slice in half.
Place 9 squares of chocolate on one half of each rectangle. Fold over the remaining half of the pastry and secure with a little egg wash. Crimp the edges with a fork then egg wash all over.
Place the pastry chocolate parcels on the baking tray and bake for 20-25 minutes.
While the pastry is cooking, whisk together the cream cheese and marshmallow fluff. Blitz the digestives.
Your parcels are ready when they are crisp and golden in colour. Allow to cool a little when they're cooked then spread with a layer of the marshmallow dip, sprinkle with biscuit crumbs and drizzle with chocolate.