In a large bowl, combine the olive oil and sugar and mix until combined.
Add the eggs, vanilla, and sourdough starter.
Mix the flour and salt together and add to the wet ingredients.
Don't over mix.
Fold in the almonds.
Divide the dough into 2 equal parts and form into a log shape that is approximately 3-4 inches wide.
Put the logs in the fridge and chill 30 minutes to an hour.
Preheat oven to 350 degrees F.
Bake the logs for 30 minutes.
Remove from oven and allow to cool for 15 minutes.
Slice into 1/2 thick slices with a bread knife.
Place the slices on the baking sheet and return to the oven for an additional 10-15 minutes. Flip them halfway through.
Biscotti is done when they are crispy all over.
Allow to cool on cooling rack.