Preheat the oven to 355°F. Line a baking sheet in parchment paper or a silicone baking mat. Set aside.
In a large bowl, beat together the eggs until fully mixed.
In a separate bowl, mix together the flour, oats, baking soda, baking powder, salt, cinnamon and nutmeg. Slowly mix into the eggs until combined.
Add in the sugar and vanilla, mixing until fully incorporated. Fold in the dates.
Place the mixture onto the prepared baking sheet, and form into a rectangle. Sprinkle some additional oats for decoration.
Bake in the preheated oven for 20 minutes.
Remove from oven and slice into 1-1.5 cm logs. Lay them with the cut side flat on the baking sheet. Lower oven temperature to 300°F.
Bake for 15 minutes, then remove, flip the sides of the biscotti and bake for an additional 15 minutes. If the biscotti is not yet firm, flip again and bake for an additional 10 minutes.