Preheat the oven to 350°F. Grease a 9-inch springform pan with butter and set aside.
Mix the shortbread cookie crumbs, sugar, melted butter, and lemon zest in a bowl. Press the mixture firmly onto the bottom of the prepared pan. Bake for 10 minutes and then cool completely on a wire rack.
Reduce the oven temperature to 325°F.
In a large bowl, beat the softened Norman's Kosher Cholov Yisroel Cream Cheese and granulated sugar with an electric mixer until light and fluffy, about 5 minutes. Add the heavy cream, eggs, and flour, and mix until well combined.
Stir in the bourbon and caramel sauce.
Pour the mixture over the cooled Lemon Bar base. Tap the pan on a counter to remove any air bubbles. Bake for 55-60 minutes or until the edges are set but the center is still slightly wobbly.
Turn off the oven, open the door slightly, and let the cheesecake cool in the oven for 30 minutes. Remove from the oven and cool completely on a wire rack.
To make the topping, heat the heavy cream and butter in a saucepan over medium heat until it comes to a simmer. Remove from heat, add the chopped chocolate and espresso powder and whisk until the chocolate is melted and the mixture is smooth.
Pour the topping over the cooled cheesecake and spread it evenly with a spatula. Refrigerate for at least 3 hours or until the topping is set.
Run a knife around the edges of the cheesecake and remove the sides of the springform pan. Cut into slices and serve chilled. Enjoy your Luscious Delight Cheesecake!