01 - Preheat oven to 325°F (160°C). Grease and line a 9-inch springform pan with parchment paper.
02 - Process ladyfingers into fine crumbs using a food processor or by crushing in a sealed bag with a rolling pin. Combine crumbs with melted butter and instant espresso powder, mixing until evenly moistened. Press mixture firmly into the base of the prepared pan. Bake for 10 minutes, then let cool completely.
03 - In a small bowl, stir together hot espresso, granulated sugar, and coffee liqueur, mixing until sugar dissolves. Set aside to cool.
04 - In a large mixing bowl, beat cream cheese, mascarpone, and sugar until smooth with an electric mixer. Add eggs one at a time, incorporating each before adding the next. Gently mix in cooled brewed espresso, vanilla extract, flour, and salt until just combined.
05 - Brush or drizzle half the cooled coffee soak evenly over the baked crust.
06 - Pour cheesecake batter over the soaked crust. Gently tap the pan on the counter to release air bubbles.
07 - Place springform pan in a water bath and bake for 60 minutes, or until the center is just set and the edges are lightly puffed. Turn off the oven, open the door slightly, and allow cheesecake to cool inside for 1 hour.
08 - Remove from oven and let cool fully at room temperature. Refrigerate for a minimum of 4 hours or overnight to set.
09 - In a clean bowl, beat heavy cream with powdered sugar and vanilla extract until stiff peaks form. Keep chilled until ready to use.
10 - Release cheesecake from pan. If desired, brush or drizzle the remaining coffee soak over the top layer. Spread whipped cream evenly across the cheesecake. Dust with unsweetened cocoa powder and garnish with dark chocolate shavings.
11 - Slice with a hot, dry knife and serve chilled for optimal texture and flavor.