Pulse Oreo cookies (filling included) in a food processor until fine crumbs form.
Stir in melted butter until the mixture resembles wet sand.
Press firmly into the bottom and sides of a 9-inch pie dish. Chill in the refrigerator while you prepare the filling.
2. Prepare the Chocolate Filling:
Melt the unsweetened chocolate and let it cool slightly.
In a heatproof bowl over a saucepan of simmering water (double boiler), whisk together the eggs and sugar. Cook for 5ā7 minutes, stirring constantly, until the mixture reaches 160°F (71°C) to safely pasteurize the eggs. Remove from heat and let cool.
In a separate bowl, beat the softened butter until light and fluffy. Gradually beat in the melted chocolate, then add the cooled egg mixture and beat until smooth and silky.
Spread the filling into the chilled Oreo crust and smooth the top. Refrigerate for at least 4 hours, or until set.