Tiramisu drop cookies made with espresso and Kahlúa, topped with creamy mascarpone frosting and cocoa powder for a bakery-style twist on classic tiramisu.
Add espresso powder and hot water to a small bowl. Mix until dissolved. Add Kahlúa and set aside to cool.
In an electric mixer, cream butter, white granulated sugar, and brown sugar. Add vanilla and egg yolk. Add espresso/Kahlúa mixture.
Slowly add crushed lady fingers, flour, cornstarch, baking soda, baking powder, and salt. Keep mixing until the dough no longer sticks to the sides of the bowl and forms a ball in the center.
Use a 1.5-tablespoon cookie scoop to add mounds of cookie dough on a baking sheet with parchment paper or a silicone baking mat. Chill the dough for 1 hour.
Preheat the oven to 400℉. Bake the cookies for 11-12 minutes until the tops are set and the centers are slightly underdone. Let cool.
Mascarpone Cream Topping
Place the cold heavy whipping cream in an electric mixer. Whip until it begins forming soft peaks.
Add the powdered sugar, vanilla extract, and Kahlúa. Continue whipping just until firm peaks form. Set aside.
In a separate bowl, gently stir the mascarpone cheese by hand with a silicone spatula just until smooth. Do not whip it.
Fold the whipped cream into the mascarpone.
Use a 1-tablespoon cookie scoop to add a mound of frosting onto each cooled cookie. Dust with cocoa powder.