In a large bowl whisk egg yolks, powdered sugar and mascarpone cheese until smooth and light in color.
2 Egg Yolks, 3/4 cup Powdered Sugar, 8 oz Mascarpone Cheese
Stir in the Kahlua and set aside.
2 tbsp Kahlua
Using a hand/stand mixer whip the egg whites on medium-high speed for about 5 minutes until stiff peaks form.
2 Egg Whites
Gently fold in the meringue to the mascarpone cream mixture.
Refrigerate for at least 20 minutes.
In the meantime, bring milk into a boil and stir in the espresso powder. Let it cool down for a few minutes before using.
1/2 cup Milk, 2 tbsp Espresso Powder
Arrange 4 dessert cups on a clean surface and pipe or spoon the cold mascarpone filling at the bottom of each cup.
Quickly, dip the ladyfingers one at a time into the espresso mixture and arrange them in a single layer. Break ladyfingers as needed to fit into the dessert cups.
8 Ladyfingers
Repeat with another layer of mascarpone filling followed by another layer of soaked ladyfingers.
Top trifles with more mascarpone filling, whipped cream if desired and dust with unsweetened cocoa powder.
Whipped Cream, Unsweetened Cocoa Powder
Sprinkle with chocolate flakes if desired.
Chocolate Flakes
Refrigerate for at least 1 hour before serving.
Enjoy!