Preheat the oven to 350°F (175°C) and line a cupcake pan with cupcake liners.
In a bowl, whisk together the flour, baking powder, baking soda, and salt.
In a separate bowl, cream the softened butter and sugar together until light and fluffy.
Beat in the eggs, one at a time, until well combined.
Gradually add the cooled brewed coffee to the butter mixture, mixing until combined.
Slowly add the dry ingredients to the wet mixture, mixing gently until just combined.
Divide the batter among the prepared cupcake liners, filling each about two-thirds full.
Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean. Let them cool completely.
In a mixing bowl, combine the mascarpone cheese, heavy cream, powdered sugar, and vanilla extract. Beat until soft peaks form.
Once the cupcakes have cooled, frost them generously with the mascarpone mixture.
Lightly dust each frosted cupcake with cocoa powder.