01 - Preheat oven to 325°F (160°C). Grease and line a 9-inch (23 cm) springform pan.
02 - Pulse ladyfinger biscuits in a food processor or crush to fine crumbs. Combine with melted butter and espresso powder until mixture is evenly moistened. Press firmly into pan base. Bake for 10 minutes, then allow to cool completely.
03 - Dissolve sugar and coffee liqueur into hot espresso, then allow mixture to cool.
04 - Beat cream cheese, mascarpone, and sugar until smooth and creamy. Add eggs one at a time, fully incorporating after each addition. Blend in brewed espresso, vanilla extract, flour, and salt just until combined.
05 - Brush or drizzle half the coffee soak evenly over the cooled crust.
06 - Pour cheesecake filling over soaked crust. Gently tap the pan to release air bubbles. Place pan in a water bath and bake for 60 minutes, or until center is set with a slight jiggle. Turn off oven, crack door, and let cheesecake cool inside oven for 1 hour.
07 - Remove from oven. Cool cheesecake at room temperature, then refrigerate for at least 4 hours or overnight until fully set.
08 - Whip heavy cream, powdered sugar, and vanilla extract to stiff peaks using an electric mixer.
09 - Detach cheesecake from pan. If desired, brush or drizzle remaining coffee soak over the top. Smooth whipped cream over cheesecake, then dust with cocoa powder and garnish with chocolate shavings. Slice and serve chilled.