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I want to make Chocolate chip cookies which is chewy and thin (spread out). I follow the recipe here http://bakerbettie.com/the-science-of-the-chocolate-chip-cookie/ however i reduced everything in half.

the result was not impressed at all. it's nothing like what you see on the website. it's thick and has a dome-like shape, not thin, not spread out, no cracks.I even put more milk in hope it might help in spreading but it still didn't spread out. I tried to use only egg york instead of the whole egg but the problem still persist. What did i do wrong??

These are my guesses. 1. Over-creaming process?? but it's melted butter (and melted butter suppose to spread, doesn't it?) 2. Egg?? Do eggs leaven the cookies?? 3. baking soda?? does it make the cookies puffy??

and one more question. How to make it flat and have cracks on the top??

Thank you

ps. sorry for my English.

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So you did melt the butter? And you used 1/2 teaspoon baking soda? Did you try mixing the egg then using half of the whole egg instead of just the yolk? Yes, baking soda will make the cookies fluffier than if you don't use it, but just using yolk might have altered that too. –  Jolenealaska Oct 11 '13 at 10:29
    
what happen if i don't use soda at all? –  Sukanok Donot Oct 11 '13 at 11:02
    
I'm not sure. The author of the recipe thinks it will make a difference, but SAJ14SAJ is right, baking soda requires an acid to make anything rise. I'm not sure that chocolate chips and brown sugar could possibly provide that acid. I definitely would try using both parts of the egg and make sure that you're not overbaking. You might as well try skipping the baking soda if the other suggestions don't work and see what happens. Be sure to let us know! –  Jolenealaska Oct 11 '13 at 11:07
    
Does mixing melted butter with sugar eliminate the whole process of creating air in cookies dough?? –  Sukanok Donot Oct 11 '13 at 16:17
    
A lot of it, yes. For what you are trying to achieve, melted butter is probably a good option. It's not a wrong way to make cookies, it's just different. –  Jolenealaska Oct 11 '13 at 20:31
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2 Answers

up vote 3 down vote accepted

The texture of cookies is a complex interaction of many factors, including the size of the cookie, the temperature of the oven, the amount of leavening, the way the fat is treated, and so on.

The flat, thin cookie with the cracks on top that you describe and desire is achieved by slightly under-baking the cookies, allowing them to rise, and then taking them out of the oven. They then cool and deflate, causing the "cracks" and thinness.

The most likely culprit is that you are over-baking your cookies, and they are setting in the oven while fully domed up. They would be fine cookies, but more of a crispy style.

A secondary, and related, contributing factor would be having the oven temperature too high. If you don't already have one, an oven thermometer is an inexpensive and helpful investment to make sure you are baking at the desired temperature, as many ovens are off by a fair margin.

Note also that these are quite large cookies, baked with a "large" scoop, only six per tray. That helps achieve the fallen state. Don't make your cookies too small, if you are looking for this texture.

To answer your sub-questions:

  1. Creaming cannot apply to a melted butter cookie, as it requires a solid but plastic fat to incorporate air into the cookie
  2. The egg contributes structure (from protein), tenderness, and usually a fairly considerable proportion of the overall water in the cookie dough
  3. In this recipe, the baking soda is primarily present to promote browning, as there is very little acid for it to react with other than from the molasses in the brown sugar (it will leaven a little). Since these are "fallen" cookies, it is harder to get good browning and therefore flavor development. The soda is to promote that.
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What do you think of the author's assertion that the baking soda provides leavening because it interacts with the acid in the chocolate? Did you notice that the author of the recipe here is the same one as here: cooking.stackexchange.com/questions/36662/… but the recipes are different? –  Jolenealaska Oct 11 '13 at 10:57
    
so before it fully baked i should take it out then leave it and it will eventually deflate, right? never thought of that before i should try it next time. Thank you. –  Sukanok Donot Oct 11 '13 at 10:58
    
@Jolenealaska In the case of the 2nd recipe in the link on this question, the author is simply incorrect. Baking soda without acid cannot leaven. Even if there is acid in the chocolate, it isn't free to interact with the baking soda. –  SAJ14SAJ Oct 11 '13 at 10:59
    
@SukanokDonot The deflation will be quite rapid as the cookies cool, certainly within 10 minutes, maybe less. –  SAJ14SAJ Oct 11 '13 at 11:01
    
This kind of cookie should still be quite soft when you take it out of the oven, and gooey, but the correct fully-baked color. –  Yamikuronue Oct 11 '13 at 12:27
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To promote spread in cookies, you want to have a fat with a low melting point and an alkaline dough. In general, butter has the lowest melting point of commonly used cookie fats, followed by non-hydrogenated shortenings; hydrogenated shortenings have the highest melting point. The low melting point allows the fat to melt and let the cookie spread before the starch gelatinizes.

An alkaline dough comes from the egg whites and using baking soda. Yolks and baking powder are both acidic and will make the dough tighter, leading to a cookie that rises more than it spreads. (The yolks won't cause much of a problem, they generally react with your baking soda to leaven the cookie. Definitely avoid baking powder if you want a cookie to spread though.)

The type of flour used can also change how your cookie bakes. A starchier flour like cake flour will lead to a taller and cakier cookie. A higher protein flour like AP or bread flour will lead to a cookie with more spread.

Finally, you don't want to add liquids like milk to most cookies. Fats and eggs won't activate the gluten in your flour, but liquids that are more watery will cause gluten development to begin. Gluten will make it harder for the cookies to spread.

As for the cracked tops, I agree with SAJ14SAJ. This is caused by the cookies falling, which can be either from being removed from the oven before the dough has set or from slightly over-leavening the cookie.

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Alkaline dough, this is new knowledge for me since i have no idea why acid can make the cookies rise and without egg yolk i wonder how cookies going to test like. about milk, i always thought that milk will help with the spreading. Next time i'll try this formula no yolks, no Milk, No baking soda. Thank you. –  Sukanok Donot Oct 12 '13 at 17:28
    
@SukanokDonot Baking soda will actually make the dough more alkaline and promote spreading. Baking powder contains acidic ingredients. –  sourd'oh Oct 12 '13 at 17:46
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