Subject: how does removing one ingredient from a cookie recipe change the cookie?

I am doing an experiment for one of my classes "how does removing an 
ingredient effect the taste of a cookie".  I am doing six different 
types of recipes.  Each recipe will exclude one indgredient.  I need 
to know the chemisty side of this process.  I have found very few 
books to help me understand the chemical process.  Thanks

Re: how does removing one ingredient from a cookie recipe change the cookie?