I tried several recipes from around the web and finally developed this one that I like. You'll probably see parts of this elsewhere, but my family claims its mine.
I usually only make half the recipe as the full one makes a bit over six dozen cookies depending upon your scoop. To do this simply halve all the ingredients EXCEPT for the sourdough. A full course there and three eggs. NOTE: I use my 5 quart Kitchen Aide bowl to make the full recipe and it is barely big enough. I usually have to mix the nuts and chips in separately by hand.
I've listed a couple of options, I am sure there are many more. Using Splenda for half the brown and white sugars does work well. Applesauce does not work well as a sub for the fats except in very small portions (1/8th or less). And you can leave the nuts out if there is a problem with allergies or walnuts.