This is the best fudge recipe - created by a man who made fudge hundreds of times to get it right. The web site has tips, variations, etc. Evidently he no longer hosts the site so others have taken it over to continue his legacy.

http://www.skaarupfudge.com/


SKAARUP'S FANTASIA FUDGE
? 1997 T. P. Skaarup, original recipe. May be copied unaltered. All
rights reserved.

This is a medium chocolate fudge with creamy texture. It serves as
the backbone to dozens of other fudges.
Follow the rules I?ve laid down on this web site and you'll do fine.

1/2 cup Butter
2 1/2 cup Sugar (extra-fine granulated preferred)
5 oz. Evaporated Milk (one small can)
12 oz Semi-Sweet Chocolate Chips (Hersheys or Nestle)
6-7 oz. Marshmallow Creme/Fluff (1 Jar)

(may substitute 2 cups mini-marshmallows)

1 cup Walnuts (chopped) -or- 4 oz. bag (optional item)
1 tsp Vanilla Extract


Directions:
Line a 9? x 9? pan with aluminum foil and set aside. Place
chocolate chips, vanilla, and marshmallow cream into a 3-quart
saucepan (or Pyrex bowl) and set aside. Chop walnuts and set
aside (optional). Heat milk at Medium setting until warm then add
sugar. Bring to a rolling boil (Medium-High), stirring constantly with
a wooden spoon. Continue to boil for [8] full minutes -or- if using a
candy thermometer continue boiling until the boiling temperature
reaches 235?F but do not exceed 9 minutes rolling boiling total.
Remove from heat and add butter. Stir until dissolved (but no more
than 30 seconds).

Pour hot mixture over chocolates, vanilla, and marshmallow cream
without scraping the sides of the hot saucepan. Mix until the
chocolates are melted. Add walnuts if desired. Mix thoroughly and
cast into prepared pan. Cool at room temperature. Chill in
refrigerator prior to cutting. Remove from pan, remove foil, cut into
squares.