LaRee McNeese's Fudge

LaRee's fudge is famous at Piper Barn Craft Show.  People come just to get her fudge and she was kind enough share her recipe with me. 

1# milk chocolate, can be Hershey Bars, chocolate chips, or she uses dipping chocolate wafers.
1 12 ounce package semi sweet chocolate chips
1 10 ounce package mini marshmellows
2 cups chopped walnuts or pecans (optional)

MEASURE ABOVE INGREDIENTS INTO A BOWL AND SET ASIDE

In a heavy pan stir over medium heat:
4 1/2 cups sugar
1 12 ounce can evaporated milk (she uses 1 1/2 cups whipping cream, so do I)
1 4 ounce cube of butter.
Stir until mixture starts to boil. Boil 5 minutes, remove from heat and quickly add set aside ingredients and mix thoroughly until chocolate and marshmallows  are melted (add nuts) and pour into a buttered 9x13 pan until set, 24 hours is a good amount of time for all the flavors to blend.
(or 1/2 pound each in small individual containers with lids).
Make 5# fudge.