Tiramisu Cheesecake

Preheat the oven to 350 degrees F (175 degrees C). Place a pan of water on the lowest oven rack.

To make the crust: Crush ladyfingers into fine crumbs. Place crumbs into a bowl with melted butter and coffee-flavored liqueur; stir until evenly combined. Press into the bottom of a 9-inch springform pan.

To make the filling: Beat cream cheese, mascarpone cheese, and sugar in a large bowl with an electric mixer until very smooth, 2 to 3 minutes. Scrape down the sides of the bowl and mix in coffee-flavored liqueur. Add flour and eggs; mix on low speed just until smooth. If batter seems too thick, mix in heavy cream. Pour batter over the crust.