My Never-Ever-Fail Chocolate Fudge

Directions

1. 1
   Combine the chocolate pieces, nuts (if using), butter, and vanilla in a large heatproof bowl.
2. 2
   Set aside.
3. 3
   Place the marshmallows, sugar, and evaporated milk in a heavy-bottomed saucepan over medium heat.
4. 4
   Stirring constantly, bring to a boil.
5. 5
   Continuing to stir, boil for exactly 6 minutes.
6. 6
   Remove from the heat and immediately pour the marshmallow mixture into the chocolate mixture; beat constantly until creamy.
7. 7
   Quickly pour into the prepared pan or platter, pushing slightly with the back of a wooden spoon to spread the fudge evenly.
8. 8
   Cool for at least 1 hour before cutting into pieces.
9. 9
   Serve at room temperature.