Roughly chop the almonds, leaving a few whole almonds.
Mix the flour, sugar, baking powder and cinnamon in a mixing bowl. Stir in all the almonds. Whisk eggs and vanilla sugar together, add to the flour mixture and knead everything into a firm dough.
Place the dough on a lightly floured work surface and knead lightly with your hands.
Halve the dough ball and shape each half into an approx. 5 cm thick roll. Place each roll on a prepared baking sheet, sprinkle with sugar and bake in a preheated oven at 180 ° C for 20-25 minutes until the rolls are browned.
Take the rolls out of the oven and let them cool for a few minutes, then cut into 1 cm thick slices (better too thin than too thick).
Turn the oven down to 150 ° C and place the biscotti side by side on the baking sheets. Bake in the oven for 15-20 minutes to the end. Remove from oven and allow to cool.