Mix Greek yogurt with honey until well combined.
Cool down espresso or strong brewed coffee.
Soak whole wheat castella or biscuits in the coffee and place them at the bottom of a glass cup.
Add an appropriate amount of the yogurt mixture on top.
Dust cocoa powder over using a sifter.
Repeat the layers two to three times.
Finally, evenly sprinkle cocoa powder on top.
Let it set in the refrigerator for at least one hour before serving.