Preheat your oven to 350°. Spray a baking sheet with cooking spray or line with a piece of parchment paper.
In a medium bowl, combine the sourdough starter discard, olive oil, garlic salt, and cheese. Stir vigorously until well blended.
Pour the batter onto the prepared pan. Use an offset spatula to spread it as thin as possible. Bake at 350 degrees for about 8 minutes, or until set.
Remove the pan from the oven and use a pastry wheel or pizza cutter to score the dough into your desired size of cracker.
Spray the crackers with water or cooking spray and sprinkle with kosher salt or flaky sea salt. Bake for another 20-25 minutes or until golden brown and crisp.
Use a metal spatula to place the crackers on a wire rack. Let the crackers cool completely. (If you can wait that long!)
Notes
I love the flavor of melted butter, but it starts to firm up when you add it to the starter, so it's much harder to mix together.
Crackers can be stored in an airtight container at room temperature for up to two weeks.
CRACKER VARIATIONS:Spicy - Use 1/2 cup of pepper jack cheese in place of the cheddar, and add 1/2 teaspoon of red pepper flakes. Sprinkle an additional 1/4-1/2 teaspoon of red pepper flakes on top with the salt.Protein Crackers - In place of the cheddar, squeeze 1/2 cup of cottage cheese dry and mash it slightly with a fork. Add 2 Tbsp grated parmesan cheese. (These take a bit longer to bake.)Basil Parmesan - Omit cheddar, add a teaspoon of dried basil and 1/4 cup of Parmesan cheese. Everything Bagel - Omit the cheese and add 2-3 teaspoons of everything bagel seasoning to the batter. (Don't sprinkle it on top, the dried onions burn!)Herb - In addition to the garlic salt, add 1-2 teaspoons of rosemary, thyme, Italian seasoning, or any herbs you enjoy. These are tasty with or without cheese.Dairy Free Crackers - Simply omit the cheese in any of the flavor variations. The crackers won't be quite as light and crisp, but they are still very tasty!