01 - Preheat oven to 325°F. Line the bottom of a 9-inch springform pan with parchment paper.
02 - In a bowl, combine crushed biscuits, melted butter, sugar, and salt. Press firmly into the base of the pan. Bake for 10 minutes. Let cool while preparing the filling.
03 - In a large mixing bowl, beat cream cheese until smooth. Add sugar and mix until combined.
04 - Beat in eggs, one at a time, scraping down the sides between additions.
05 - Add alcohol-free Irish cream, sour cream, cornstarch, vanilla, and salt. Mix until just combined. Do not overmix.
06 - Pour filling over the cooled crust and smooth the top.
07 - Place the springform pan in a larger roasting pan. Fill the roasting pan with hot water to reach halfway up the sides of the cheesecake pan.
08 - Bake for 50-60 minutes, or until the edges are set but the center is slightly jiggly.
09 - Remove from oven, let cool in the water bath for 30 minutes, then remove and chill in refrigerator for at least 4 hours or overnight.
10 - Heat cream and butter in a small saucepan until just simmering. Remove from heat, add chopped chocolate, and let sit for 2 minutes. Stir until smooth.
11 - Pour ganache over chilled cheesecake, spreading evenly. Chill for 30 minutes to set. Slice and serve chilled.