Dissolve the gelatin as directed. Mix the cappuccino powder with the hot water and allow to cool. Mix the mascarpone, powdered sugar and eggnog. Stir in the dissolved gelatine and the cooled cappuccino liquid. Whip the cream until stiff and fold into the cream. Break the ladyfingers and place in the cream.
Chill the mixture for 2 hours and sprinkle with cappuccino powder before serving.