In the bowl of a stand mixer or large mixing bowl, combine flour, sourdough discard, olive oil and salt. With the mixer running on low speed, add the water. Increase speed to medium until a smooth dough forms (you may also find it easier to knead by hand until the dough is smooth). The dough should not be sticky. If it is, add a pinch more flour until you reach your desired consistency.
Use a sharp knife to divide the dough into two pieces. Place each on a piece of parchment paper, then flatten the dough into a disk using your hands. Let sit for 5 minutes.
Preheat oven to 450°F.
Use a rolling pin to roll the dough to 1/16-inch thickness. This should nearly cover the full piece of parchment paper. Sprinkle the dough with your chosen toppings, and lightly roll across the dough once more to press the toppings into the dough.
Use a pizza cutter or sharp knife* to cut the crackers to your desired size and shape. Use a fork to prick holes in each cracker to prevent them from puffing up while baking. Transfer the entire sheet of parchment paper, with the dough, onto your baking sheet.
Bake for 10-12 minutes, watching carefully in the last few minutes, until just beginning to brown at the edges. Remove from the baking sheet and let cool fully before serving.
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Notes
*You can also use cookie cutter to cut shapes into the dough. To make this recipe with active sourdough starter, replace the sourdough discard with active starter (200g). You do not need to change any other ingredients in the recipe.