What is the difference between whole egg and egg yolk in cookies?

I'm trying out different gingerbread cookie recipes and one of the big differences I'm noticing is that some recipes call for a whole egg and others use just the egg yolk. How much does this make a different in the end result?

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Droplet November 12, 2017
Generally, using whole egg(s) in cookies gives a fluffier, softer cookie. Yolk(s) only go in crispier or more crumbly varieties. Within the context of the rest of the ingredients and method used, end results vary though. Hope this helps some.
 
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