Prep & Preheat
Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix Cookie Dough
In a bowl, cream together butter and sugar until light and fluffy. Beat in eggs and vanilla. In a separate bowl, whisk flour, baking powder, salt, cocoa powder, and espresso powder. Gradually fold dry ingredients into wet until just combined.
Shape Cookies
Scoop out dough (about 1.5 tablespoons each) and roll into balls. Place on the baking sheet, leaving room to spread. Flatten slightly with your hand or the bottom of a glass.
Bake
Bake for 10–12 minutes, until edges are lightly golden but centers are soft. Don’t overbake—chewy is key. Cool completely on a wire rack.
Prepare Mascarpone Filling
Whip heavy cream to soft peaks. In another bowl, combine mascarpone, powdered sugar, and vanilla. Gently fold whipped cream into mascarpone until smooth and airy.
Assemble Cookies
Spread or pipe a generous dollop of mascarpone filling onto one cookie. Top with another cookie, gently pressing to sandwich the cream. Repeat with remaining cookies.
Optional Topping
Dust with cocoa powder or shave chocolate over the top for that authentic tiramisu look.
Chill & Serve
Chill for 30–60 minutes to let filling firm up. Then… devour!