The Role of Eggs in Baking Cookies

Posted on Jan 6, 2014 in Baking Tips | 15 comments

The Role of Eggs in Baking Cookies

Eggs are so wonderful and they do so much for cookies in baking.  As the egg cooks, it holds your cookies together giving them their structure and shape. That’s why you can have some cookie batters that can be super runny and liquidy but if they contain extra eggs they will just puff up when the cookies bake instead of spreading out. The egg keeps it all held together.

role of eggs in bakng

And egg yolks.  Oh so delicious egg yolks! These guys are essential in chewy rich cookies.  The fat in egg yolks tenderizes the dough by shortening the gluten strands, gives your cookies a richer flavor and will also help make cookies chewier. Because egg yolk is a natural emulsifier it makes your cookie batters smooth with a creamy texture.  This is why it’s typically recommended to add the eggs in one at a time.  When you are emulsifying the eggs into the butter you want to make sure the eggs are emulsifying with the butter and not  just other eggs.

role of eggs in baking

Then there’s egg whites. Egg whites on the other hand can dry cookies out so make sure your cookie recipe has enough sugar to make up for the drying effect of egg whites. Some of my favorite recipes eliminate egg whites entirely resulting in super rich dense and chewy cookies.

You may have heard that room temperature eggs are better for baking.  If you need to separate egg yolks from egg whites, cold eggs separate better but in baking warm eggs whip better and incorporate more air into your batter than cold eggs.  This can cause major changes when baking cakes that call for a lot of eggs in the recipe but when baking cookies, cold eggs do not typically make a difference.

The ratio of sugar to eggs and flour can dramatically change your end cookie. If the ratio of sugar to flour and eggs is high, the cookie collapses creating a denser, chewier cookie. If the ratio is even higher, the resulting cookies are thin and crisp-like. If there are more flour and eggs, than sugar the cookies are light and cake-like. You can totally play around with this in your cookie baking until you achieve the right ratio for your favorite cookie in taste and texture. For more baking hows and whys check out my free ebook How to Bake Cookies written to help you become the best cookie baker ever!


  1. Thank you so much! This really helped me in baking in a school project, keep doing you and bake!

  2. thank you so much im doing a scince project and this helped A LOT thank you !!!!

  3. I didn’t know eggs needed to be at room temperature – what a great tip!

  4. Hi Liz, your baking explanations are amazing. I am definitely going to start letting my eggs get to room temperature before baking from now on. Pinning 🙂

    • Thanks Jordan! Baking can be so scientific and sometimes the littlest things make a BIG difference!

  5. I just love eggs – it’s magical what the egg white and yolk can do together and separately. This is such an interesting post. : )

    • Thank you Monica! Isn’t it crazy how amazing the egg really is!?

  6. as someone who is totally NOT a baker, this is seriously awesome. Pinning!

    • Thanks Christine and THANK YOU for pinning!! You are awesome!

  7. Great post! Love all this info. 🙂

  8. Thanks for the education!! I love knowing the science behind baking because it is so precise.

    • Totally! I think understanding some of the science behind baking makes better bakers for sure!

  9. I love this post! Baking is such a science and it’s important to know why recipes are built the way that they are! This is a good reminder so I am definitely pinning it!

    • Thanks Taylor and thank you for pinning!! I totally agree and love learning the why’s behind baking!


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