4g vanilla extract. Except for Greek yogurt, apply it later on top like cream.
Separate the egg yolks and whites.
Add sugar to the yolks and mix well.
Add mascarpone cheese and mix thoroughly.
Whip the egg whites and add sugar to make meringue.
Combine the yolk mixture with the meringue.
Soak castella or ladyfingers in espresso and layer them in a dish.
Spread the cream on top and repeat.
Sprinkle cocoa powder.
Chill for at least 2 hours in the refrigerator.