1-First Step: Prepare Your Crust Oreo Crust: Pulse 20 regular-stuffed Oreo cookies in a food processor until finely ground. Mix with 3 tablespoons melted unsalted butter until combined. Press mixture into the bottom and sides of a pie dish. Bake at 350°F (175°C) for 10 minutes, then cool completely. Traditional Crust: In a bowl, combine 180 grams all-purpose flour and ½ teaspoon kosher salt. Cut in 85 grams cold unsalted butter and 30 grams shortening until mixture resembles coarse crumbs. Gradually add 57–85 grams ice water, mixing until dough holds together. Wrap and chill for at least 30 minutes. Roll out dough, fit into pie pan, dock with a fork, chill again. Blind bake at 400°F (205°C) on bottom rack for 20 minutes with pie weights, remove weights, and bake an additional 12-15 minutes until golden. Cool completely.

2-Second Step: Cook Sugar and Eggs In a saucepan, whisk together 1 1/3 cups granulated sugar and 4 large eggs. Cook over medium-low heat, whisking constantly until reaching 160°F (72°C), ensuring eggs are safely cooked and mixture thickens enough to coat the back of a spoon. Remove from heat immediately.

3-Third Step: Add Chocolate and Cool Stir melted and cooled chocolate (113–226 grams) and 2 teaspoons vanilla extract into the egg-sugar mixture until smooth. Cool to room temperature, stirring occasionally to prevent skin formation.

4-Fourth Step: Cream Butter and Mix Beat 10 tablespoons unsalted butter until light and fluffy. Gradually add cooled chocolate mixture to butter and beat on high for about 5 minutes until filling is fluffy and silky smooth.

5-Fifth Step: Fold in Whipped Cream Whip 1 1/3 cups cold heavy cream with 4 teaspoons powdered sugar to stiff peaks. Gently fold whipped cream into chocolate mixture in three parts, maintaining airiness and mousse-like texture.

6-Sixth Step: Assemble and Chill Pour filling into cooled crust, smoothing top with a spatula. Refrigerate for at least 4–6 hours or overnight to set fully and develop flavor.

7-Final Step: Whip Topping and Garnish Whip 1 cup cold heavy cream with 2 tablespoons powdered sugar and 1 teaspoon vanilla extract until stiff peaks form. Spread or pipe whipped cream over set filling. Garnish with chocolate shavings or a dusting of cocoa powder before serving.