Prepare a 9-inch springform pan with parchment paper, and preheat an oven to 180c (350f). Start by making the crust: pulse oreos in a food processor until fine crumbs form. If you don’t have a food processor on hand, place the Oreos in a Ziplock bag and smash the oreos with a cup until fine crumbs form. Into a small to medium mixing bowl, add the Oreos, granulated sugar, and melted butter. Mix with a spoon until the crumbs are coated with butter. Transfer the crumbs into a prepared 9-inch cake pan, pressing evenly and firmly into the pan.
Bake the crust in a 180c (350f) preheated oven for 8 minutes. Keep an eye on the crust and make sure it doesn’t burn. Take the crust out of the oven and let it cool to room temperature.
Lower the temperature to 140c (280f). In a big mixing bowl, add the room-temperature cream cheese, granulated sugar, sour cream, kosher salt, espresso powder, and vanilla extract, and mix with an electric hand mixer until the cream cheese is creamy. Whisk the eggs with a fork, add them to the cream cheese batter along with the Irish cream, and mix until the mixture is creamy and smooth. Scrape down the sides of the bowl to make sure you get everything mixed.
Pour the cheesecake batter over the crust, and release air bubbles by gently tapping the pan onto a flat surface.
Bake the cheesecake in a 140c (280f) preheated oven for about an hour or until the edges of the cheesecake are set, but the middle is a bit jiggly.
Open the oven door halfway, and let the cheesecake cool to room temperature for 1-2 hours.
After the cheesecake is cooled, wrap the cheesecake with plastic wrap tightly, and place the cheesecake in the fridge to cool completely for at least 5 hours.
Melt dark chocolate and heavy cream in a small to medium mixing bowl in the microwave for about a minute. Let the chocolate and the cream sit for 10 minutes for the chocolate to melt, then mix until the chocolate ganache is smooth and silky.
Add the baileys into the chocolate ganache and mix until creamy and smooth.
Pour the chocolate ganache on top of the cheesecake and smooth it out with an offset spatula. Place the cheesecake in the fridge to allow the ganache to set while you make the coffee whipped cream.
Make whipped cream by whipping heavy cream, powder sugar, and vanilla extract in a large mixing bowl until stiff peaks form.
Pipe the whipped cream with a star tip around the edges of the cheesecake and top with chocolate shavings. Serve and enjoy!