Light Olive Oil (Best Option)
1:1 (replace 1 tablespoon vegetable oil with 1 tablespoon light olive oil)Light olive oil has a fatty acid profile similar to vegetable oil, providing the necessary fat to tenderize the crumb and improve moisture retention without interfering with gluten development. Its mild flavor ensures the sourdough's tang remains prominent.
When using light olive oil, ensure it is fresh and not overly fruity or pungent to avoid altering the bread's flavor. It blends well with the dough and does not affect fermentation.
Compared to vegetable oil, light olive oil produces a very similar crumb texture and crust, making it the closest substitute in both function and flavor neutrality.