This is the recipe I have used since I was in high school.

1 stick oleo
1 regular size can evaporated milk (I always use Milnot)
4 cups sugar
Dash of salt
12oz bag semi-sweet chocolate chips
1 jar marshmallow creme
1 cup chopped nuts (I use pecans)

Melt oleo in large saucepan. Add milk, salt and sugar.  Bring to boil over medium heat, stirring frequently to prevent scorching. Cook to soft ball stage. Remove from heat. Add choc chips and marshmallow creme. Stir until melted. Stir in nuts. Pour into buttered 9 X 13 pan.