01 - Preheat oven to 325°F (160°C). Grease and line a 9-inch springform pan.
02 - Pulse ladyfinger biscuits into fine crumbs using a food processor. Mix with melted butter and instant espresso powder until the consistency is even. Firmly press mixture into the bottom of the springform pan. Bake for 10 minutes. Set aside to cool completely.
03 - Dissolve granulated sugar and coffee liqueur in hot espresso, stirring until dissolved. Set aside to cool.
04 - In a large bowl, beat together cream cheese, mascarpone, and sugar until smooth and creamy. Add eggs one at a time, mixing thoroughly between each addition. Blend in the brewed espresso, vanilla extract, flour, and salt until just incorporated.
05 - Brush or drizzle half of the cooled coffee soak evenly over the baked crust.
06 - Pour the cheesecake batter over the soaked crust. Lightly tap the pan to remove air bubbles.
07 - Set the pan in a water bath and bake for 1 hour, or until the center is set but slightly wobbly. Turn off oven, crack the door open, and allow cheesecake to cool inside for 1 hour.
08 - Remove from oven and cool at room temperature. Refrigerate at least 4 hours, or overnight, until fully set.
09 - Whip heavy cream, powdered sugar, and vanilla extract together until stiff peaks form.
10 - Release cheesecake from pan. Brush or drizzle any remaining coffee soak over the surface for additional flavor if desired. Smooth the whipped cream over the top. Dust generously with unsweetened cocoa powder and garnish with chocolate shavings. Slice and serve chilled.