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To make the crust: Preheat the oven to 375°F. In a medium-sized mixing bowl, combine the crumbs, sugar, salt, and butter.
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Press the mixture into the bottom and up the sides of a 9” metal pie pan.
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Line the crust with foil or parchment paper, and fill it with pie weights or dried beans. Bake the crust for 12 minutes.
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Remove the crust from the oven, and gently remove foil or parchment with the weights or beans.
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Return the crust to the oven for 4 to 6 minutes longer, until the bottom is shiny and bubbly and the cookie crumbs smell deeply of chocolate.
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Remove the crust from the oven, and set it aside to cool to room temperature.
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Heat the chocolate sauce so that it pours easily, then pour it into the cooled crust, brushing it all over the inside.
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Place the chocolate-coated crust into the freezer while you make the ice cream.
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To make the ice cream: Whisk or mix together the milk, sugar, espresso powder, and cocoa until the sugar has dissolved. Stir in the heavy cream and vanilla.
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Freeze the ice cream in an ice cream maker according to manufacturer's directions. Stir in the cookie pieces at the end.
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Meanwhile, to make the topping: Whip the cream and sugar until firm peaks form.
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Remove the fudge-lined crust from the freezer. Spoon the ice cream into the crust, then spoon or pipe the whipped topping onto the pie.
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Put the pie in the freezer until firm and ready to serve, about 2 hours. If you’re freezing the pie longer, let it thaw for 15 to 20 minutes before serving.
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When ready to serve, drizzle extra chocolate sauce either over the whole pie, or each individual slice.
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Storage information: Freeze leftover pie, wrapped in plastic, for up to 2 weeks.