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Place the pie crust in a pie pan and prick the bottom with a fork, then following the directions on the box bake until golden brown. Set aside.
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Whisk together sugar, cocoa, cornstarch and salt and put in a pot.
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Add the beaten egg yolks and milk bringing to a boil, stirring constantly.
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Remove from heat immediately adding butter, vanilla and chocolate chips. Stir until well blended.
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Pour the creamy chocolate into the prepared pie crust and set in refrigerator until set.
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Top with Cool Whip, Dream Whip, or real whipped cream and sprinkle crush candy canes on top.