Crush 22 Oreos into fine crumbs using a food processor or a plastic bag and rolling pin.
Mix the ground Oreos with the melted butter in a bowl, then press the mixture firmly into the bottom of an ungreased 9-inch springform pan.
Put the pan on a cookie sheet and bake it for 8 minutes, then remove from the oven to let the crust cool.
Lower the oven temperature to 325 F.
In a large bowl, beat the cream cheese until fluffy, then beat in the condensed milk, eggs, and vanilla at a medium-low speed until smooth.
Break the remaining cookies into small and medium chunks, then stir them into the filling.
Tap the bowl of batter on the counter for 30-45 seconds to remove any air bubbles.
Pour the batter into the cooled crust, then bake the cheesecake for 30 minutes.
Reduce the oven temperature to 250 F and continue baking the cheesecake for 45 minutes.
Turn off the oven when the cheesecake is just slightly wobbly, and allow it to cool inside the oven for 30 minutes.
Crack open the oven door and let the cheesecake cool for another hour.
Take the cheesecake out of the oven and let it cool for another hour until it reaches room temperature. Cover with plastic wrap and refrigerate for at least 6 hours.
To make the chocolate ganache, melt the chocolate chips together with the cream in the microwave, heating in 20-second increments and stirring in between until the mixture is smooth.
Spread the ganache over the cheesecake and refrigerate for another 30 minutes to set.
Run a knife around the edges of the cheesecake in the pan, then remove the sides of the springform pan.
If desired, decorate the cheesecake with whipped cream and additional cookies. Refrigerate the cheesecake until you're ready to eat it.