In a large bowl, place chocolate chips and broken up chocolate bars. Make a depression in chocolate pieces, then scoop marshmallow creme into it.
In a medium saucepan, cook sugar, salt, butter, and milk for about 8 to 10 minutes. (Start timing after boiling begins) Remove from heat, add chocolate chip mixture, vanilla, and chopped nuts. Mix RAPIDLY with large wooden spoon. Pour into buttered pans.