Make the base by crushing gluten free biscuits with a rolling pin in a large bowl to form crumbs (Alternatively, blitz them in a food processor). Stir in the melted dairy free butter and press into the base and up the sides of a greased 9” fluted flan tin. Place in the fridge while you make the filling.
Make the chocolate filling by adding dairy free double cream to a saucepan on a medium heat until it starts to simmer. Remove from the heat and stir in dark chocolate until melted. Add vanilla extract and maple syrup, mix well.
Pour the chocolate mixture over the biscuit base. Transfer the melted dairy free chocolate to a piping bag and snip the top off with scissors. Use the piping bag to draw a swirl in the tart and then use a knife or skewer to create a spider web effect. Press in halloween sprinkles and edible eyes.
Place back in the fridge to set for 3 hours before serving. Store in the fridge for up to 3 days.