Step 1

Pour the milk into a medium sized pot and warm over low heat. Break up the chocolate bars and add them to the milk. Stir pretty frequently until they are melted.

Step 2

Add marshmallows to chocolate mixture and stir until marshmallows are melted.

Step 3

Remove from heat and allow to cool to room temperature. Once cool, stir in 1 cup of the whipped topping. Whisk well to combine.

Step 4

Pour the mixture into the pie crust. Cover with the lid from the pie crust or wrap lightly with plastic wrap. Refrigerate overnight to set. Top with remaining Cool Whip and shaved chocolate (if desired). Serve.