01 -
Butter an 8 x 4-inch metal loaf pan and line it with parchment paper, allowing overhang for easy removal.
02 -
Microwave semi-sweet chocolate chips and unsalted butter in 30-second intervals, stirring between each, until smooth and glossy.
03 -
Stir in cocoa powder, granulated sugar, and instant espresso powder into the melted chocolate until sugar begins to dissolve.
04 -
Incorporate one whole egg and one egg yolk, whisking vigorously for 1–2 minutes to achieve a fudgy and smooth batter.
05 -
Sprinkle flour and fine sea salt into the batter and fold gently just until no dry streaks remain to maintain gooey texture.
06 -
Spread the batter evenly in the prepared pan and bake at 350°F (175°C) for 25–30 minutes until the edges pull away and the center jiggles slightly. The internal temperature should reach at least 180°F (82°C).
07 -
Brew a strong shot of espresso and let it cool completely. Optionally, add coffee liqueur to the cooled espresso for enhanced flavor.
08 -
Whip mascarpone, vanilla bean paste, and sugar gently until combined. Slowly add cold heavy cream and whip on medium speed until soft peaks form. Chill until ready to layer.
09 -
Quickly dip each ladyfinger into the cooled espresso mixture and arrange them in a single layer over the cooled brownie base.
10 -
Mound or pipe the mascarpone cream evenly atop the ladyfingers, smoothing or swirling to your preference.
11 -
Refrigerate the layered bars for at least one hour until set. Before serving, generously dust the top with Dutch process cocoa powder and slice with a sharp knife.