Separate the egg yolks and whites.
Add erythritol to the yolks and mix well.
Beat the egg whites until stiff peaks form.
Mix mascarpone cheese into the egg yolk mixture.
Gently fold the meringue into the cheese mixture.
Make coffee syrup by combining Americano and espresso.
Lightly dip whole wheat or oat biscuits into the coffee syrup.
Layer the soaked biscuits at the bottom of a dish.
Spread the cheese cream on top of the biscuits.
Repeat the layering process twice to create layers.
Sift unsweetened cocoa powder over the top.
Refrigerate for at least 2 hours until set.