In large bowl put in the chocolate bars (broken bits) and the marshmallow cream. Grease a 9X13 inch cake pan with butter or margarine. In a fairly deep pot put in the sugar, salt, milk, and butter. Mix well put on medium heat stirring constantly until it comes to a full boil. Let boil for 13 minutes (exactly) remove from stove pour over chocolate bits, milk chocolate and marshmallow cream. Beat till smooth Refrigerate for about 2 to 3 hours Cut into pieces. keep refrigerated so it will stay moist and creamy can be frozen will not turn white.