“A long hydration time is important because eggs, unlike, say, water, are gelatinous and slow-moving, she said. Making matters worse, the butter coats the flour, acting, she said, “like border patrol guards,” preventing the liquid from getting through to the dry ingredients. The extra time in the fridge dispatches that problem. Like the Warm Rule, hydration — from overnight, in Mr. Poussot’s case, to up to a few days for Mr. Torres — was a tactic shared by nearly every baker interviewed.

And by Ruth Wakefield, it turns out. “At Toll House, we chill this dough overnight,” she wrote in her “Toll House Cook Book” (Little, Brown, 1953). This crucial bit of information is left out of the version of her recipe that Nestlé printed on the back of its baking bars and, since in 1939, on bags of its chocolate morsels.

At 12 hours, the dough had become drier and the baked cookies had a pleasant, if not slightly pale, complexion. The 24-hour mark is where things started getting interesting. The cookies browned more evenly and looked like handsomer, more tanned older brothers of the younger batch. The biggest difference, though, was flavor. The second batch was richer, with more bass notes of caramel and hints of toffee.”

Source: http://www.nytimes.com/2008/07/09/dining/09chip.html?pagewanted=2&_r=1

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