Grease and line a 20cm square brownie tin.
In a large saucepan, melt the chocolate, golden syrup, butter and salt on a low heat.
Place the 200g biscuits in a freezer bag and bash them into pieces. It’s good to have a mixture of biscuit dust, smaller and larger pieces.
Add the biscuits, marshmallows, raisins and puffed rice to the melted chocolate mixture and stir through until completely covered.
Empty the mixture into the lined baking tin, spreading evenly.
Pop it in the fridge and chill for 2 hours minimum.
To decorate, dust with icing sugar or drizzle with melted vegan white chocolate.