Baileys Cheesecake

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1. 1Step 1: Preheat the oven to 350F degrees.
2. 2Step 2: Wrap the outside of a 9-inch springform pan in aluminum foil. Wrap it at least 3 times so that the bottom and up the sides are covered, and there are no seams showing.
3. 3Step 3: Blitz the Oreo cookies in a food processor until they're crushed cookie crumbs.
4. 4Step 4: Add in the melted butter and pulse a few times to combine.
5. 5Step 5: Press the mixture into the bottom and slightly up the sides of the prepared pan.
6. 6Step 6: Bake the crust in the preheated oven for 10 minutes. (Leave the oven turned on).
7. 7Step 7: Beat the cream cheese until soft, then beat in the sugar.
8. 8Step 8: Sift in the cocoa powder and cornstarch, then beat in the sour cream. Turn off the mixer and scrape down the sides of the bowl.
9. 9Step 9: With the mixer on low speed, beat in the eggs 1 at a time.
10. 10Step 10: Fold in the Baileys using a large rubber spatula.
11. 11Step 11: Pour the cheesecake batter on top of the crust and smooth the top.
12. 12Step 12: Place the cheesecake pan (still wrapped in aluminum foil) in the middle of a large roasting pan.
13. 13Step 13: Pour about 1/2 - 1 inch of hot water into the roasting pan so that the cheesecake is surrounded by water (this is your water bath).
14. 14Step 14: Place the roasting pan with the cheesecake inside in the oven and bake for 55-65 minutes, or until the top looks just set, but the cheesecake still has a slight wobble in it.
15. 15Step 15: Remove from the oven and let the cheesecake cool to room temperature (while still in the water bath).
16. 16Step 16: Remove the cheesecake pan from the water bath, cover lightly, and place in the fridge to chill for at least 6 hours before serving.
17. 17Step 17: Chop the chocolate into very small pieces and place in a glass, heatproof bowl.
18. 18Step 18: Add the cream to a small saucepan over medium heat, and heat the cream to a gentle simmer while stirring.
19. 19Step 19: Pour the hot cream over the chopped chocolate and let sit for 1-2 minutes.
20. 20Step 20: Whisk the mixture until smooth, then whisk in the Baileys. If the chocolate isn't fully melted, heat in the microwave for 30 seconds on medium heat.
21. 21Step 21: Remove the cheesecake from the fridge.
22. 22Step 22: Gently trace around the edge of the cake with a thin, sharp knife. Unclamp the springform.
23. 23Step 23: Drizzle the ganache over the cake, and optionally top with whipped cream.