01 -
Preheat oven to 350°F (180°C), or 325°F (170°C) if using convection. Wrap a 9-inch springform pan with aluminum foil, covering bottom and sides in multiple layers to prevent water seepage.
02 -
Crush Oreo cookies with their filling to fine crumbs using a food processor or by hand in a freezer bag. Combine with melted butter and mix until evenly moistened.
03 -
Firmly press crumb mixture into the bottom of the prepared pan, forming a slight lip along the edges. Bake for 8 minutes. Remove from oven but leave wrapped in foil; keep oven on.
04 -
Combine instant coffee powder and Kahlua in a small bowl until the coffee is fully dissolved.
05 -
In a large bowl, beat cream cheese and granulated sugar until smooth, scraping down sides regularly. Beat in sour cream until blended. Mix in the Kahlua-coffee mixture on low speed. Taste the batter and add 1-2 tablespoons more Kahlua if desired.
06 -
Whisk together eggs and egg yolks in a separate bowl. Beat eggs into the cream cheese mixture in 2-3 additions, scraping bowl and mixing just until fully combined.
07 -
Place the springform pan with cooled crust in the center of a large roasting pan. Pour cheesecake batter into the pan and smooth the surface. Pour hot water into the roasting pan to reach 1/2 to 1 inch up the sides.
08 -
Bake for 50-60 minutes. Center should wobble slightly when gently shaken, but not appear liquid.
09 -
Turn off oven and let cheesecake cool in the closed oven for 1 hour. Remove roasting pan, cool cheesecake in the water bath until water is room temperature. Transfer springform pan to a wire rack and cool until just warm.
10 -
Cover pan with foil or plastic wrap. Refrigerate until fully chilled, at least 6 hours or overnight.
11 -
Place finely chopped chocolate in a heatproof bowl. Heat cream and Kahlua together until steaming, then pour over chocolate. Let stand for 3 minutes, then whisk until smooth. Microwave briefly if needed to melt any remaining lumps.
12 -
Remove cheesecake from fridge. Carefully remove foil. Use a thin knife to release edges, unclamp springform pan. Blot condensation from surface if present.
13 -
Pour ganache over the cheesecake, spreading evenly and allowing some to drip over the sides. Refrigerate until set. To serve, slice with a sharp, thin-bladed knife, cleaning it between cuts.