01 -
Get your oven hot at 350°F (175°C). Cover two baking trays with parchment or silicone mats.
02 -
Toss salt, baking powder, and flour into a bowl and give them a good whisk so it all comes together.
03 -
In a big bowl, beat the softened butter and sugar with an electric mixer so it gets fluffy and pale.
04 -
Crack in the eggs, one after another, mixing after each. Splash in that vanilla and stir until it's all mixed up.
05 -
Stir instant coffee into hot water till it melts. Pour it into the butter-egg bowl and mix until you don't see streaks.
06 -
Tip your flour mix into the wet stuff bit by bit. Stir just until it's all together—don't go wild with the mixing.
07 -
Drop little dough mounds—about a tablespoon each—onto your trays. Leave a couple inches between them for spreading.
08 -
Let them bake for around 10–12 minutes. You want barely golden edges and soft, slightly gooey middles.
09 -
Take trays out. Let cookies cool there for 5 minutes, then move them over to a wire rack so they finish cooling.
10 -
Grab a bowl and beat mascarpone with heavy cream until it's super smooth and thick.
11 -
Pour coffee liqueur into that mascarpone mixture and keep mixing till it looks like one even filling.
12 -
Spread filling on the flat side of a cookie, press another cookie on top, and keep going till all are done.
13 -
Shake cocoa powder over your sandwiches. Eat them now or stick them in the fridge for 30 minutes so the middle firms up.