Place Oreo cookies into the bowl of a food processor with a blade attachment. Pulse until the cookies are turned into finely chopped cookie crumbs. Transfer the crumbs to a medium bowl.

Add the melted butter and toss with a fork to combine.

Press the cookies into a 9-inch pie pan, covering the bottom and sides to form an even crust. Refrigerate 30 minutes. Wipe out the bowl; you will need it again for the ganache.

Place the semi-sweet chocolate chips into the bowl used for the crust mixture. Set aside.

In a small saucepan over medium-high heat, bring the heavy cream just to a boil. Pour the hot cream over the semi-sweet chocolate chips. Cover with a kitchen towel and let sit for 3 minutes.

Remove the towel and whisk the ganache until it's shiny.

Remove the pie crust from the refrigerator. Pour the ganache into the pie crust, using a spatula to spread evenly across the bottom and up the sides. Set the remaining ganache aside and set the pie crust back in the refrigerator.

In another medium bowl, whisk together the instant pudding mix and oat milk until it thickens.

Remove the heavy cream mixture from the refrigerator. Fold half of the whipped cream into the pudding mixture. Set in the refrigerator.

In a medium bowl, stir together the cream cheese, confectioners' sugar, and cocoa powder until the consistency is light and fluffy.

Pour in the heavy cream. Use a hand mixer or whisk to whip the mixture until medium-stiff peaks form. Set in the refrigerator.

Pour the bittersweet chocolate chips into a microwave-safe bowl. Microwave in 15-second increments, stirring each time until the chocolate is melted.

Add the cream cheese and granulated sugar, stirring to combine.

Remove the pie crust from the refrigerator. Pour the filling into the pie crust. Use a spatula to spread the filling into an even layer. Return the filled pie crust to the refrigerator for 15 minutes to set.

Remove the chocolate pudding from the refrigerator. Spread the pudding in an even layer over the filling. Refrigerate the pie again for another 10 minutes.

Remove the pie and chocolate whipped cream from the refrigerator. Spread the whipped cream mixture in an even layer over the pudding.

Garnish with chunks of crumbled Oreo cookies and serve cold.