Make it more set in the middle
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More added liquid went with cookies that came out more set in the middle, across 912 versions. Flour protein plus available water plus agitation builds an elastic network that resists the bite.
Costs you: Nothing else moved that we can measure — but this lever sits on a real trade, gooey middle or cooked through, and we cannot put a number on that side of it.
measured across many versions · 912 versions
Make it chewier · flatter and wider · sweeter
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More sugar went with cookies that came out flatter and wider, across 830 versions. Sugar is hygroscopic in the dough too. It binds water and denies it to the flour, suppressing gluten.
Costs you: Also makes it crisper at the edge.
measured across many versions · 830 versions
Make it more tender · more crumbly
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More butter went with cookies that came out more tender, across 799 versions. Butter is 16-18% water. Cold or creamed butter locks that water in fat crystals where the flour cannot reach it; melted butter frees it, so gluten forms before baking.
Costs you: Nothing else moved that we can measure — but this lever sits on a real trade, chewy or cakey, and we cannot put a number on that side of it.
measured across many versions · 799 versions
Make it crisper at the edge · less sweet
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More salt went with cookies that came out less sweet, across 21 versions.
Costs you: Nothing else moved that we can measure. We only detect 7 of the 60 changes cooks describe, so read that as unmeasured rather than free.
thin evidence — treat as a hint · 21 versions