Add the oreos (with the filling) and the butter to a food processor. Pulse the mixture until smooth and sandy. [Alternatively, crush the oreos super finely in a large ziploc bag, then stir in the melted butter.]
Press the mixture into the bottom and a little bit up the sides of a 9" tart pan, then place the pan into the fridge to firm up while you make the filling.
French Silk Pie
Finely chop up the chocolate and set it aside.
Add the eggs and sugar to a medium sized saucepan. Set the mixture over medium heat, and vigourously whisk the mixture until it reaches a temperature of 170℉ / 76℃.
Remove the mixture from the heat, and immediately stir in the chocolate. Stir until the mixture is cohesive, then set it aside to cool for at least 20 minutes.
In the meantime, whip up the whipped cream. Add the heavy whipping cream to a medium sized mixing bowl. Beat the mixture with a hand or stand mixer until it reaches stiff peaks. Set aside in the fridge.
Add the butter and salt to a medium sized mixing bowl. With a hand or stand mixer, beat the butter and salt for 3-4 minutes, until it's light and fluffy.
With the mixer running, start adding in big dollops of the chocolate egg mixture, mixing until combined before adding in the next. Once all of the chocolate has been incorporated, beat the mixture for an additional 2-3 minutes, until light and fluffy.
Add in the whipped cream and very gently fold it into the chocolate mixture.
Pour the pie filling over the chilled oreo crust. Cover the pie with plastic wrap and set it in the fridge for at least 4 hours, or until the filling is firm.
Whipped Cream
(Save this step until you're ready to serve the pie)
In the bowl of a stand mixer fitted with the whisk attachment (or with a hand mixer in a large bowl), beat the heavy cream, sugar, vanilla, and espresso powder until the mixture reaches medium peaks (a little softer than stiff peaks).
Pile the whipped cream high on top of the chilled silk pie. Slice, serve, and enjoy!