Line two nine inch baking tins with foil and grease with non stick spray.
Butter the sides of a large saucepan and add in the sugar, evaporated milk, butter and salt.
Cook over a medium heat until boiling then reduce the heat and continue to cook for around ten minutes more stirring continually.
In a bowl combine the chocolate chips and chopped chocolate and the marshmallow cream.
Pour the hot mixture over the ingredients in the bowl and stir until the chocolate in melted.
Stir in the mini marshmallows and chocolate chips then pour into the prepared baking tins.
Cover then place in the fridge to chill for at least three hours.
Slices then store in an airtight container between sheets of parchment paper.
Keep in the fridge for up to three weeks. Out of the fridge consume within 48 hours.