24 chocolate sandwich cookies (like Oreos) 5 tbsp (75 ml) unsalted butter, melted Pinch of salt 1 (9-inch) store-bought chocolate cookie crust (optional) 2 / 3 cup (135 g) granulated sugar 1 / 4 cup (25 g) unsweetened cocoa powder 1 / 4 cup (30 g) cornstarch 1 / 4 tsp fine salt 3 cups (720 ml) whole milk 4 large egg yolks 4 oz / 115 g semisweet chocolate, chopped 2 tbsp (30 ml) unsalted butter 2 tsp (10 ml) vanilla extract 1 cup (240 ml) heavy whipping cream, cold 2 tbsp (15 g) powdered sugar 1 / 2 tsp (2.5 ml) vanilla extract Chocolate shavings or cocoa powder (optional garnish)
Make the crust: Heat oven to 350°F. Finely crush the cookies (a food processor or bag-and-rolling pin both work). Mix crumbs with melted butter and a pinch of salt until evenly moistened. Press the mixture firmly into the bottom and up the sides of a 9-inch pie plate. Bake 8–10 minutes, then cool completely. If using a store-bought crust, skip baking and use as is. Make the filling base: In a medium saucepan off heat, whisk together sugar, cocoa, cornstarch, and salt. Gradually whisk in the milk until smooth with no dry pockets. Cook the pudding: Set over medium heat, stirring constantly with a whisk or flexible spatula, until thick and bubbling, 5–8 minutes. Temper the eggs: Place yolks in a bowl. Slowly whisk in about 1 cup of the hot mixture, then return it all to the saucepan. Cook 1–2 minutes more at a gentle bubble, stirring, until glossy and very thick. Finish the filling: Remove from heat and whisk in the chopped chocolate, butter, and vanilla until smooth. Strain through a fine-mesh sieve into a bowl if you want an extra-silky filling. Fill and chill: Pour the hot filling into the cooled crust and smooth the top. Press plastic wrap directly onto the surface. Refrigerate until fully set, at least 4 hours or overnight. Whip the topping: Beat cold heavy cream, powdered sugar, and vanilla to soft peaks. Spread or pipe over the chilled pie. Garnish with chocolate shavings, if desired. Serve: Slice with a warm knife for clean cuts. Refrigerate leftovers, covered, for up to 3 days.
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