In a medium bowl, combine your sourdough starter with water, flour, salt and oil. Stir until it comes together, then turn the dough onto the counter and knead for 3–5 minutes, until smooth and elastic.
Cover the dough and let it rest at room temperature for 4–8 hours, until puffy and airy. For a slower fermentation, refrigerate the dough overnight.
Once fermented, divide the dough into small pieces about the size of ping pong balls. Shape each piece into a smooth ball and let rest 15 minutes before rolling out. This helps the gluten relax so the dough rolls easily.
On a lightly floured surface, roll each ball into a 3–4 inch circle, about ¼ inch thick.
Cook on Cast Iron – Heat a cast iron skillet over medium heat.
Once hot, place a flatbread in the pan and cook until bubbles form and the bottom develops light golden spots, about 1–2 minutes. Flip and cook the second side for another minute.
Let the flatbreads cool completely before packing or stacking.