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1 Position a rack in the center of the oven and preheat the oven to 350u00b0F. Lightly butter a 9-inch pie pan.
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2 To make the crust, combine the crumbs, melted butter, and sugar in a medium bowl until moistened. Press firmly and evenly into the pie pan. Bake until the crust is set and smells like warm cookies, about 12 minutes. Cool completely.
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3 To make the filling, in a medium saucepan over medium heat, heat 2 1/2 cups of the half-and-half, the sugar, and the salt, stirring often to dissolve the sugar, until simmering. Pour into a heatproof bowl. Rinse out the saucepan.
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4 In a small bowl, sprinkle the cornstarch over the remaining 1/2 cup half-and-half and whisk until dissolved. Whisk the yolks in a medium bowl, and gradually whisk in the cornstarch mixture. Gradually whisk in the hot half-and-half mixture and return to the rinsed-out saucepan. Cook over medium heat, stirring constantly with a flat wooden spatula (to keep the mixture from scorching), until it comes to a boil. Reduce the heat to medium-low and let the mixture bubble, stirring constantly, for 1 minute. Remove from the heat, add the chocolate, butter, and vanilla, and whisk until the chocolate melts completely. Strain through a wire sieve into a clean bowl.
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5 Pour the filling into the cooled crust and press plastic wrap directly on the filling to keep a skin from forming. Let cool completely. Refrigerate until the filling is chilled and set, at least 2 hours.
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6 To make the topping, whip the cream, confectioners' sugar, and vanilla in a chilled medium bowl with an electric mixer set on high speed until stiff. Uncover the pie. Spread and swirl the topping over the filling. (If you wish, transfer the whipped cream to a pastry bag fitted with a star tip, and pipe the cream onto the pie.) Sprinkle pie with cookie crumbs. Slice and serve chilled.
