In a large bowl using a wire whisk, beat milk, pudding mixes and 1/2 of the Cool Whip for 1 minute, until mixture begins to get thick. Spread evenly into crust.
Spread remaining Cool Whip over set pudding layer. Using a zester, grate a part of a chocolate bar over the top as garnish.
Refrigerate one hour before serving.
Notes
While it can be served immediately, it's best when refrigerated at least 1 hour.