Tiramisu Brownies

Name: Tiramisu Brownies
Prep time: 45 min
Cook time: 40 min
Total time: 1 h 25 min
Cuisine: American
Ingredients: 100 g dark or semi-sweet chocolate (finely chopped); 50 g natural cocoa powder; 230 g unsalted butter (roughly cubed); 4 large eggs (room temperature); 150 g granulated sugar; 100 g brown sugar; 100 g all-purpose flour; 250 g mascarpone cheese (cold); 200 g whipping cream (cold); 50 g powdered sugar; 1/2 teaspoon vanilla extract; 2 teaspoons espresso powder; 150 g hot water; 1 tablespoon coffee liqueur or dark rum (e.g. Kahlua (optional)); 12 ladyfingers; 1 tablespoon cocoa powder (for dusting)