Combine sugar, salt, butter and evaporated milk in a medium sized sauce pan and boil for 6 mins. When boiling, the sauce will expand 2 to 3 times so use a large enough sauce pan, keep stirring and be careful it gets very hot!
In a large bowl, add chocolate bars (break into small pieces), chips, marshmallow cream and nutmeats (optional). Tip: I prepare this part before boiling the items in step 1 so that it's ready to go.
Pour boiled syrup over chocolate, marshmallow and nutmeats and beat until chocolate is melted.
Pour into buttered 16 x 11 baking pan (half sheet pan).
Allow to sit and cool for a few hours (or better over night) before cutting into 1 in squares. Place in the refrigerator to speed the hardening process.
Store in an air tight container.