Alton Brown's recipes, hands down. I don't even pretend to think that I'll ever try anything else any more. I made 4 kinds of cookies including one of his CCC recipes and the CCC were practically inhaled. Even *I* couldn't keep my hands off them.
The Chewie is the one I favor:
The Chewy Recipe : Alton Brown : Recipes : Food Network
He also has 2 other varieties:
The Thin Recipe : Alton Brown : Recipes : Food Network
The Puffy Recipe : Alton Brown : Recipes : Food Network
See how it's done:
Years ago I had my own recipe for soft chewy chocolate chip cookies. The secret? 100% brown sugar, melting the butter (but I did use regular old AP flour) and chilling the dough before baking. The cookies softened up nicely, absorbing water from the air, as AB's Cookie Fiend notes, mostly due to the hygroscopic qualities of the brown sugar.
A friend insisted on knowing my secret. When I told him, he immediately pronounced himself "grossed out" at the idea of eating a cookie that got and retained its moisture due in part to what it could absorb from the air.
Its not like we lived in a smog zone.
So, I stopped making that recipe. I had to - he told EVERYBODY, and passed along his low tolerance for what he decided was the "yuck" factor - nobody wanted them anymore! With friends like that ... well anyway.
Then Alton Brown comes along with a similar (though undoubtedly improved) version of the same recipe, with the same explanation for why the cookies stay moist, and he's a kitchen GOD! Nobody complains to HIM about an icky factor associated with cookies that absorb air from the environment!
*sigh* Oh well. I have always been and shall always be a Kitchen Barbarian, I suppose. LOL!