The cookie dough without refrigeration also browned less. So, the longer the dough is chilled, the more the cookies change The longer you chill cookie dough, the smaller the changes become. Call it the law of diminishing returns. KREhN-V7' alt='Cookie Dough Recipe' title='Cookie Dough Recipe' />The major difference is between no chilling at all vs. After that, the baked cookie continues to evolve though very gradually. Over time, chilling cookie dough produces cookies with darker color and more pronounced flavor. Here you see the beginning and end of the test clearly the cookie baked from dough chilled for 1. Its flavor is also more pronounced our taste testers couldnt identify any particular flavor note that stood our above the rest, but simply noted that the 1. My personal evaluation is that the cookies baked immediately tasted rather flat and their texture was soft and rather doughy, without being chewy. Cookies baked after chilling the dough for as little as 3. So, what does chilling cookie dough do, exactlyChilling cookie dough controls spread. Chilling cookie dough before baking solidifies the fat in the cookies. As the cookies bake, the fat in the chilled cookie dough takes longer to melt than room temperature fat. And the longer the fat remains solid, the less cookies spread. In addition, the sugar in the dough gradually absorbs liquid. If you bake the dough immediately, before sugar has a chance to absorb much liquid, that liquid remains free in the dough, and promotes spread. Think of this in terms of thin vs. Same with cookies. Thats fresh dough, at left three day old dough, at right. The longer the dough chills, the drier it becomes. Chilling cookie dough concentrates flavor. As the dough chills, it gradually dries out, concentrating the flavors of all the ingredients. Think of watered down lemonade, vs. Same with cookies. Something else happens as the dough rests part of the flour breaks down into its component parts, including a simple carbohydrate, sugar. Thus, since sugar is a flavor enhancer like salt, the cookies may taste more flavorful, as well as sweeter. Chilling cookie dough changes texture. Again, its not really the chilling, but the dough gradually drying out, thats responsible for texture change. The drier the dough, the more concentrated the sugar. And a higher percentage of sugar creates cookies with chewycrisp rather than softdoughy texture. So, enough with the science lets enjoy one of these fresh baked chocolate chip cookies, shall weAt the end of the day or even after just 3. Do you have any chocolate chip cookie tips to pass along Please share in comments, below.