01 -
Flip on your oven to 175°C. Cover two baking trays with silicone mats or parchment. Get those ready first.
02 -
Toss salt, baking powder, and plain flour into a bowl. Give everything a good whisk so it's all blended nicely.
03 -
Grab a big bowl and use your mixer to beat the soft butter and sugar till the mix looks light and fluffy.
04 -
Crack in the eggs, mixing one after the other so they blend in. Then add the vanilla and mix again.
05 -
Stir the instant coffee into the hot water so it dissolves, then dump it into your butter-egg mix. Give it a solid stir until it’s all one color.
06 -
Now scoop in the dry mixture a little at a time into the wet bowl. Don’t over-do it—stop mixing once it all sticks together.
07 -
Spoon balls of dough (about a tablespoon) onto your lined trays. Keep about 5 cm between each. Bake until the edges are barely golden but the middle is still soft—about 10 to 12 minutes.
08 -
Let the cookies hang out on the tray for 5 minutes, then carefully move them to a rack. Let them cool completely before you touch them again.
09 -
In another bowl, whip up the mascarpone and heavy cream until it’s completely blended. Add the coffee liqueur and mix just enough to pull it all together.
10 -
Take one cooled cookie, slap some filling on the flat side, and press another cookie on top. Easy peasy.
11 -
Sprinkle sifted cocoa powder on your finished cookie sandwiches. Eat them right away, or stash in the fridge for half an hour to help the filling set.