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 salted caramel sauce.
Make the salted caramel sauce by adding coconut milk, light brown sugar and vanilla extract to a saucepan on a medium heat. Stir until it comes to a boil and then continue to stir for 20 minutes, until thickened slightly. Take off the heat and stir in 1 teaspoon of salt. Pour into the biscuit base and place back in the fridge for an hour before making the chocolate 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 caramel mixture and place back in the fridge to set for 2 hours before serving.
Optional, grate any remaining chocolate over the top for decoration.