Science Fair Experiment - Cookies! - Yum 1

For the science fair this year my daughter decided to do something really useful.  The first time we made snickerdoodles they stayed as rounded balls and were soft days after.  The next time I made the cookies using the same recipe they turned out flat and more crispy.  I have made the cookies since then and they remain flat cookies.  So, she decided to see if she could replicate the mistake that must have been made the first time. 

We researched possible ingredients that could make a difference.   Chemistry in the kitchen!  The reactions created by the ingredients contributes to the final product.  These were all possibilities we came up with for the mistake -

1.  More flour than called for
2.  Used bread flour instead of all purpose
3.  One egg instead of two
4.  Salted or unsalted butter
5.  Used a different amount of baking soda/ cream of tartar

We have tried using more flour and indeed the cookies were taller, but they were still not round like the first batch.  They measured 3/4 inches in height.   On to more experimentation - Yum!