Optional: Chocolate shavings or holiday sprinkles for garnish
Instructions
Prepare the crust: Combine the chocolate wafer crumbs, 6 tablespoons melted butter, 1/4 cup granulated sugar, and 1/4 teaspoon salt in a bowl. Press the mixture firmly into the bottom and up the sides of a 9-inch pie plate. Bake at 350°F (175°C) for 10 minutes. Let the crust cool completely.
Make the chocolate filling: In a medium saucepan, whisk together the 1/2 cup granulated sugar, cocoa powder, cornstarch, 1/4 teaspoon salt, and cream of tartar. Whisk in the whole milk until smooth.
Cook the base: Heat the mixture over medium heat, stirring constantly, until it thickens significantly and comes to a boil. Boil for 1 minute while stirring. Remove from heat.
Temper the egg yolks: In a small bowl, whisk the egg yolks. Slowly pour about 1 cup of the hot chocolate mixture into the yolks while whisking constantly.
Combine: Pour the tempered yolk mixture back into the saucepan with the remaining hot chocolate. Cook over medium heat, stirring constantly, for 1 minute until the mixture is very thick. Do not boil again.
Finish the filling: Remove the saucepan from the heat. Stir in the 2 tablespoons of butter and 1 teaspoon of vanilla extract until the butter melts and the filling is smooth.
Chill the filling: Pour the hot filling into the cooled Oreo crust. Press plastic wrap directly onto the surface of the filling to prevent a skin from forming. Refrigerate for at least 4 hours, or until completely cold and set.
Make the topping: In a large bowl, beat the heavy whipping cream, powdered sugar, and 1 teaspoon vanilla extract with an electric mixer until stiff peaks form.
Assemble the pie: Spread or pipe the whipped cream evenly over the chilled chocolate filling.
Decorate and serve: Garnish with chocolate shavings or holiday sprinkles. Keep refrigerated until ready to serve. This pie is best made one day ahead.
Notes
For a no-fail chocolate cream pie, make sure to temper the egg yolks slowly to prevent scrambling.
If you do not have chocolate wafer cookies, you can substitute with graham crackers and add 2 tablespoons of cocoa powder to the crust mixture.
Chill the pie for a minimum of 6 hours for the best texture before slicing.