In a bowl, mix 500 g mascarpone with 2 tbsp powdered sugar and 6 tbsp Granko until smooth and creamy.
In a separate bowl, whip 500 ml whipping cream with 2 tbsp powdered sugar and 1 packet of whipped cream stabilizer.
Gently fold the whipped cream into the mascarpone mixture until you have a light and fluffy cream.
In a cup or small saucepan, heat 200 ml milk with 3 tbsp Granko to make the cocoa mixture. Let it cool slightly.
Arrange the ladyfingers in a single layer in your serving dish and pour some of the warm cocoa mixture over them.
Spread half of the mascarpone cream over the ladyfingers and sprinkle with Granko.
Add another layer of ladyfingers soaked with the cocoa mixture and finish with the remaining mascarpone cream.
Sprinkle the top generously with Granko.
Refrigerate the tiramisu for at least 5 hours, ideally overnight, to allow it to set completely.