2 pkg. (12 oz. each) semi-sweet chocolate
1 c. butter
1 jar marshmallow fluff
1 (12 oz.) can evaporated milk
4 1/2 c. sugar
1 tbsp. vanilla
2 c. chopped nuts

Put first three ingredients in bowl (set aside). In heavy large saucepan (I use pressure cooker pan), put in milk and sugar. Bring to rapid boil, stirring continuously for nine minutes. Pour over ingredients in bowl and mix well. Beat with electric beater until well blended. Stir in nuts and vanilla. Pour into lightly buttered 15 x 10 x 1 pan. Chill 12 to 24 hours. Cut into pieces (I cut mine before chilling for easy cutting).