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Immediately after I remove my cookies from the oven, they start to deflate and lose some of their puffiness. What are the primary causes of this?

This occurs with both old and new baking soda; though the effect is lessened with new baking soda. This happens with most kinds of cookies. I chill the cookie dough in the fridge while baking each batch.

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Are you trying to prevent this? Only certain kinds of cookies are really expected to stay tall. –  Jefromi Mar 19 '12 at 18:11
    
Yes, I want to prevent or reduce the deflating, and end up with cookies with some body, rather than super-flat cookies with occasional chocolate chip mountains. –  KatieK Mar 19 '12 at 18:31
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Hm, if they're thinner than the chocolate chips, maybe they're going a bit farther than they're supposed to. I was thinking of the difference between, say, normal flat-ish chocolate chip cookies and something like chocolate crinkles. –  Jefromi Mar 19 '12 at 18:57
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1 Answer

up vote 4 down vote accepted

What are the primary causes of this?

The steam and other hot gasses that were puffing the cookies up either escapes or condenses. Without heat to create more steam, the cookies deflate.

You get exactly the same effect with bread, quiches, and other baked goods. You can hear bread start to make a crackling sound almost as soon as it comes out of the oven, and the sound continues for some minutes until the bread has cooled a bit. Quiches are always quite puffy looking when they're in the oven, but they start to shrink a bit as they cool.

If you want your cookies to shrink less, you might try cooking them at a slightly higher temperature, or cooking them a bit longer, or perhaps not chilling them so much prior to baking. Bumping up the amount of egg white in the cookie may help, too. The idea is to get the structure of the cookie to set a bit more by the time you remove the cookies from the oven. That will, of course, cause the cookies to be less chewy and more crunchy.

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