1. Prepare the Crust:

1. Preheat your oven to 350°F (175°C).
2. Combine Oreo cookie crumbs, granulated sugar, and melted butter in a bowl. Mix until the texture resembles wet sand.
3. Firmly press the mixture into the base of a 9-inch springform pan, ensuring it forms an even layer.
4. Bake for 10 minutes, then let it cool while you prepare the filling.

2. Make the Cheesecake Filling:

1. In a large bowl, mix the softened cream cheese and granulated sugar together until the mixture is smooth and creamy.
2. Mix in the vanilla extract and eggs, one at a time, until fully incorporated.
3. Add the sour cream and heavy cream, mixing until the batter is smooth.
4. Fold in the crushed chocolate chip cookies gently to distribute them evenly.

3. Assemble and Bake:

1. Pour the cheesecake filling over the prepared crust, smoothing the top with a spatula.
2. Place the springform pan on a baking sheet and bake for 60-70 minutes, or until the center is slightly jiggly but set.
3. Turn off the oven, crack the door open slightly, and let the cheesecake cool in the oven for 1 hour.
4. Remove and refrigerate for at least 4 hours, preferably overnight.

4. Prepare the Cookie Monster Topping:

1. In a bowl, beat the heavy cream, powdered sugar, and vanilla extract until stiff peaks develop.
2. Spread or pipe the blue buttercream frosting over the cheesecake.
3. Pipe dollops of whipped cream on top and decorate with mini chocolate chip cookies for a fun Cookie Monster theme.