In a large bowl, combine the starter, eggs, olive oil, vanilla extract, and pumpkin puree.
In a separate bowl, combine the flour, sugar, salt, and pumpkin spice.
Add dry ingredients into the wet ingredients and mix just until combined. Do not over mix.
Divide the dough into 2 equal parts and form into a log shape that is approximately 3-4 inches wide
You can put the logs in the fridge to chill while the oven is preheating. Alternatively you can leave the dough in the fridge for up to a week for a long fermented version of the recipe.
Bake the logs for 30 minutes.
Remove and allow the logs to cool for 10-15 minutes.
Slice with a serrated knife each log into 1/2-3/4 inch thick slices.
Place these slices on the baking sheet and allow to bake an additional 20-25 minutes flipping halfway through or until lightly golden brown.
Allow to cool completely on a wire rack.
Notes
Store biscotti in a plastic bag or airtight container for up to 5 days.