Gather your ingredients so that you have everything close at hand on the counter or table.
Make the Cracker Dough
In a medium bowl, combine the all-purpose flour, kosher salt, unfed sourdough starter, and extra virgin olive oil. If desired, add in your favorite seasonings.
Knead by hand 7-10 times, until dough becomes smooth.
Cover with plastic wrap and refrigerate for 30 minutes or more, for the dough to become firm.
Form the Crackers
When ready to make the crackers, preheat oven to 350°F. Divide dough in half. Working with one piece at a time, press dough out by hand or a rolling pin to flatten. At this point, you may roll out the dough on a lightly floured surface with a pastry/pizza roller or a rolling pin.
Place thin sheet of dough on an unlined baking sheet. Poke holes in the thin dough using a roller docker or fork. This will help keep the crackers from bubbling when baked.
If desired, use a pastry wheel to slice the crackers into whatever shape you want–squares, rectangles, etc.
(Sometimes, I leave the dough intact for baking and then break into rough crackers after they’ve baked for a very rustic appearance.)
Next, lightly smooth a little bit of extra virgin olive oil over the dough with a pastry brush or your fingers. Sprinkle sea salt over the dough. Repeat with second ball of dough.
Bake and Break the Crackers
Bake one pan at a time in a preheated oven for 10-12 minutes until edges begin to brown, turning the pan halfway through the baking period to help the crackers cook evenly.
It may be necessary to remove crackers that are baking faster than others. This happens when crackers are thinner, or for those baking along the edge of the pan. I try to check the crackers every 1-2 minutes after the eight or ten minute mark, depending on the thickness of the crackers.
When crackers are golden brown, remove the baking sheet from the oven and transfer the crackers to a large bowl to cool. When crackers have cooled, store in an airtight container or plastic bag for up to 3 weeks. This recipe will fill two baking sheets and will make between 40-50 crackers.