Preheat oven to 180C/350F.
In a large bowl, lightly whisk the eggs together.
Add pumpkin puree, egg, sunflower oil, sourdough starter and vanilla together in a bowl. Use a fork to whip these ingredients together to form a light batter.
Now add all the other dry ingredients on top and stir thoroughly to combine. You don't want to over mix the batter, but stir it just enough to ensure all of the dry ingredients are moistened.
Pour mixture into a buttered loaf tin.
Bake at 180C/350F for around 1 hour. Baking time will depend on the size of your tin and your oven.
The sourdough pumpkin quick bread is cooked when a skewer is inserted and comes out clean.
Allow to cool for 30 minutes before removing from the tin. It's normal for the sourdough discard pumpkin spice bread to sink a little in the middle as it sets and cools.
After 30 minutes, carefully take the loaf out of the pan and sit it on a wire rack to cool before slicing.