Preheat the oven to 170°C (338°F).
Wash the mugwort thoroughly and chop finely.
In a bowl, add eggs and sugar and whisk until foamy.
Add olive oil and mix well.
Sift in cake flour, baking powder, and salt.
Add the mugwort, cooked chestnuts, and almonds, and mix to form a dough.
Shape the dough into a long log and place it on a baking tray.
Bake in the oven at 170°C (338°F) for 25 minutes.
Let it cool and cut into 1.5 cm thick slices.
Bake the slices again for an additional 10 minutes to form biscotti.