• Place a large rimmed baking sheet on the very bottom rack of the oven and fill it halfway with water. Preheat the oven to 350°F. Line a 9-inch springform pan with parchment paper.

For the Crust

• Place the cookies, cream filling included, in a food processor. Pulse until the cookies are crushed into crumbs.
• Mix together the cookie crumbs and butter. Press the crumbs evenly into the bottom of the prepared pan. Set aside.

For the Cheesecake

• Beat the cream cheese until creamy. Add the sugar, sour cream, and vanilla and beat until very smooth.
• Spoon in the melted chocolate and beat until incorporated completely. Add the flour and beat again.
• Add the eggs on at a time, beating well after each addition. Make sure the eggs are fully incorporated, but do not overbeat the batter.
• Pour the cheesecake batter onto the prepared crust. Place the pan on the oven rack right above the pan of water. Bake the cheesecake for 45 minutes.
• Remove the pan from the oven and place it on the wire rack. Let the cheesecake cool for 5 minutes, then run a sharp knife around the edges of the cheesecake to loosen it from the springform pan.
• Let the cheesecake cool for 1 hour, then refrigerate it for 4 to 6 hours, or until completely chilled.
• Detach the springform pan ring and gently remove the cheesecake from the pan. Slide the cheesecake onto a plate.

For the Mousse

• Beat the cream cheese and vanilla until creamy. Spoon in the melted white chocolate and beat the mixture until smooth.
• Fold in the Cool Whip with a rubber spatula until everything is completely mixed together. Pipe the mousse on top of the chilled cheesecake with a piping bag and icing tip 1M. Refrigerate the cheesecake for one hour to let it set up.

For the Topping

• Place the cream and chocolate chips in a microwave-safe bowl and microwave for 15 to 20 seconds. Stir the chocolate until melted and creamy. Drizzle the chocolate over the top of the cheesecake.