Sarah Kieffer started banging sheet pans in ninth grade. She was going through “a cookie phase,” trying to find the perfect chocolate chip recipe, and one of them wasn’t working out. While most cookies spread in the oven, this one stayed put.
“It was just this ball of dough that didn't fall, so I hit the pan in the oven because I was mad,” she told me over the phone. “That helped.” The cookies deflated, thinned out, and spread more.
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