The night before or at least 4 hours prior to beginning bread making, refresh your sourdough starter.
Add 1 cup of active sourdough starter to large nonmetallic bowl.
Place the bowl with starter on a kitchen scale and tare to 0. Add 300 grams of filtered water and combine with nonmetallic mixing utensil.
Tare scale to 0 with bowl on top. Add 450 grams of flour.
Tare scale to 0 with bowl on top. Add 10 grams of sea salt.
Remove bowl from scale and combine ingredients with nonmetallic mixing utensil. Dough will be rough looking.
Cover bowl with large plate or lid and allow to rest for 20 minutes.
Uncover bowl. Use 1 wet hand to stretch and fold the dough 10-15 times while holding and turning the bowl with the other hand. Cover bowl and let rest 20 minutes.
Keeping dough in the bowl, repeat stretch and fold process 2 more times at 20 minute intervals. Dough will be fairly wet. The dough should be more flexible at each interval
Cover with plate or lid and let proof 4-5 hours.
Uncover bowl. Using a wet hand, stretch and fold dough in bowl to bring it together.
Lay 2 large sheets of parchment paper out onto a flat surface and lightly dust each with flour. Separate the dough into two pieces with your hands and place one dough piece on each floured parchment paper sheet. Dust the top of each dough piece with flour and flour your hands. By pressing the dough with your fingers, spread each dough piece out into a large round or oval shape, until about 1/2 an inch thick. Add more flour as needed to prevent sticking to your fingers.
Cover dough rounds with a linen cloth.
Let proof for a final 60-90 minutes.
Place stone or cast iron or pizza pan into oven and preheat to 475 °F
Once oven is preheated, gently lift 1 dough round with parchment paper and place on pizza pan. Bake for 15 minutes.
Remove flatbread and repeat with 2nd dough round.
Allow flatbreads to cool for 10 minutes before serving.
Optional: drizzle olive oil on top or make an olive oil and herb dip.