Mix sourdough discard, warm water, and yeast in a large bowl. Add salt and bread flour, then mix until a sticky dough forms. Cover and rest for 15 minutes.
Perform 3 sets of stretch and folds, resting for 15 minutes between each set. Let the dough rise for 30 minutes until doubled in size.
Pour 50g of olive oil into a 9x13 pan and spread evenly. Transfer the risen dough into the pan, gently spreading it out. Cover and proof for 1 hour.
Preheat the oven to 450ºF. Drizzle 30g of olive oil on top of the dough, dimple with your fingers, sprinkle flaky sea salt, and bake for 25 minutes until golden.
Cool completely before slicing. Enjoy!
Notes
For extra flavor, try adding rosemary, garlic, or sun-dried tomatoes before baking. Delicious warm or toasted the next day!