Line a 9x13 baking dish with foil or parchment paper. This makes it easier to remove the fudge and cut it.
Place chocolate chips, marshmallow cream, butter, vanilla, and nuts in a large bowl. Set aside for later.
Pour sugar and evaporated milk in a very large pot.
Bring mixture to a rolling boil, THEN start a timer and cook for 4 minutes stirring continuously.
Remove from heat and pour into the bowl containing the first mixture. Mix until incorporated completely.
Pour into prepared pan. Allow to cool at room temperature for about an hour and then refrigerate until set.
Slice into squares and serve.