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Melt the butter and let it cool to room temperature. This step is very important — if the butter is not fully cool it will not incorporate into the batter.
Preheat your oven to 325°F.
Mix the starter, butter, and salt together with a whisk. Whisk briskly until the batter is smooth with no visible oiliness. If the batter is breaking, the butter may have been too warm. Stick the batter in the fridge for 20 minutes and then try whisking it again!
Add the grated Parmesan cheese and stir it in evenly.
Line a half sheet pan (18 by 13-inch) with parchment paper. Using a rubber spatula, spread the batter to the edges of the pan in a smooth even layer.
Place the sheet pan in the middle of the preheated oven and bake for 30 minutes.
After 30 minutes, remove the pan and score the batter with a pizza cutter, making cracker-sized squares. Or skip this step and break the crackers later.
If the crackers are noticeably brown at this time your oven may be running hotter than mine. Turn your oven down to 300°F and continue with the rest of the recipe.
Return the pan to the oven and continue baking for 30 more minutes.
Turn the oven off and open the door ¼ of the way. Let the crackers cool completely in the warm oven.
Store the finished crackers in an airtight container.