Preheat the oven to 180°C (356°F).
Mix whole wheat flour, baking powder, salt, and sugar in a bowl.
Add eggs and vanilla extract, and knead the dough.
Stir in mixed nuts such as almonds.
Shape the dough into a long log and place it on a baking sheet.
Bake for 25-30 minutes in the oven.
Let it cool slightly, then slice.
Bake the slices again for 10-15 minutes until crispy.