I've never personally hairdried a biscuit in an attempt to wick the heat away from the cookie before. It'd probably work - on no-heat, obviously, but then I think that maybe using a small standing fan would be more productive than having to manually blow-dry each individual cookie.

But, oh, I see, you were thinking one-half of each side for each cookie... the "rack" method would be easier to work with, but I still think a simple fan would increase productivity. But, in a pinch, a blowdryer would work, too. (I should try it, we have them laying around, anyways.)

Regarding the egg yolk, it'll just add more protein and moisture to the mix. So technically, I think this recipe will result in a moister/chewier cookie, but that also depends on how long the cookie is baked for.

I'm going to have to remember where I saw "Just Bunches" up here, since it's not everywhere, which makes my shopping a little more scattered. Until then, I'll just have to settle for granola clusters.