For the Irish Coffee cake, separate the eggs and beat the egg whites until stiff. Beat the yolks, whiskey, cocoa powder, coffee powder and powdered sugar until creamy. Mix in flour, baking powder and oil well, then carefully fold in the snow.
Pour the batter into a springform pan (square or round) and bake in the oven at 180 °C top/bottom heat for about 30-40 minutes. Let the cake cool down.
For the cream, whip the coffee powder with the whipped cream, powdered sugar and gelatine until stiff, add the whiskey. Spread the jam on the cake base and spread the cream on top.
Refrigerate the cake for about 4 hours.
For the decoration, mix the soft butter with powdered sugar to a creamy buttercream. Divide the cream into 3 parts. Color 1/3 of the cream with orange food coloring, color the other third with green food coloring, leave the third third white.
Spread the cake with the buttercream in the colors of the Irish flag (green, white, orange). Decorate the Irish Coffee cake as desired.