Preheat your oven to 350°F (180°C) and line a 9-inch (22 cm) cake pan with parchment paper.
In a bowl, whisk together the flour and baking powder.
In another bowl, cream the butter and sugar until light and fluffy. Then, add the eggs one at a time, mixing well after each addition.
Stir in the strong coffee. Gradually fold in the dry ingredients until just combined, being careful not to overmix.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely in the pan before slicing it horizontally into two layers.
In a bowl, combine the mascarpone cheese, heavy cream, and powdered sugar. Whip until stiff peaks form.
Spread the mascarpone cream evenly over the bottom layer of the cake, then carefully place the top layer on top.
Frost the top and sides of the cake with the remaining cream. Sprinkle with coffee powder for decoration.
Refrigerate the cake for at least 1 hour before serving to allow the flavors to meld.
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