01 -
Preheat oven to 180°C (350°F) or 170°C (325°F) for convection. Wrap a 23 cm springform pan with aluminum foil 3-4 times covering bottom and sides, leaving interior uncovered to prevent leaks.
02 -
Crush Oreos to fine crumbs using a food processor or rolling pin in a bag. Combine crumbs with melted butter, press evenly into pan bottom with a slight edge. Bake 8 minutes. Remove and keep oven on.
03 -
Dissolve instant coffee powder into 60 ml Kahlua. Beat cream cheese and sugar until smooth, scraping sides frequently. Mix in sour cream. On low speed, blend Kahlua-coffee mixture in. Taste and add up to 30 ml more Kahlua if desired.
04 -
Whisk whole eggs with additional yolks. Add eggs gradually to cream cheese mixture in 2-3 batches, mixing just until fully combined and no egg visible, scraping bowl after each addition.
05 -
Place foil-wrapped pan with crust in center of large roasting pan. Pour batter into crust, smoothing top. Pour hot water into roasting pan to 2-3 cm depth around springform pan.
06 -
Bake 50-60 minutes on middle-lower oven rack until edges set but center slightly wobbly like jelly. Remove pan from oven and water bath when done.
07 -
Allow cheesecake to cool in water bath to room temperature. Remove springform pan and place on wire rack until no longer warm. Cover top and refrigerate minimum 6 hours or overnight.
08 -
Combine cream and Kahlua; heat until near boiling. Pour over chopped chocolate and let sit 3 minutes. Whisk until smooth, reheating gently for 30 seconds if lumps remain.
09 -
Release springform pan side and remove foil. Wipe any condensation gently. Pour ganache evenly over chilled cheesecake. Return to fridge until serving. Slice with a sharp thin knife, wiping blade between slices for clean cuts.