Line a 9x13-inch pan with foil or parchment paper and lightly grease.
Place the broken Hershey's bar, chocolate chips and marshmallow creme in a large bowl.
In a medium saucepan, combine the sugar, evaporated milk and butter, and stir until the sugar and butter are melted. Bring to a rolling boil and boil for 4½ minutes. Immediately remove from the heat and pour over the chocolate, chocolate chips and marshmallow creme. Quickly stir until all of the chocolate is melted and the mixture is smooth.
Pour the mixture into the prepared pan and spread into an even layer. Cool at room temperature until set, about 2 hours. The fudge can be stored in an airtight container at room temperature or in the refrigerator for up to 1 month.
Nutritional values are based on one piece of fudge