I use the WASC recipe also. But i start with a butter cake mix, use the brown sugar instead of white lots of vanilla and chocolate chips. I fill mine with ganache or a marshmallow and cream cheese filling..super yummy
dont you just love WASC? I have made everything from margarita to a graham cracker cake with it! I tried a red velvet too my in laws loved it but i thnk it needs to be perfected lol
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I think getting a chocolate chip cookie flavor in a cake form will be tough. A lot of that flavor comes from the browning of the brown sugar and butter. Next time I would use dark brown sugar (more molasses) and add some butter.
Or, you could try crushing cookies and adding them to the batter...
I'm on my phone and can't figure out how to make a link to it, but there is a sticky for "gourmet" flavors. Many of the recipes are a wasc recipe and there is a great chocolate chip cookie one.
Sorry, I was on my phone and couldn't do much for you. Hopefully the link below will take you to the recipe (and so many others!). As for the sticky, when you go the forums, there are some threads that are always at the top, those are stickies. They are "stuck" at the top so people can find them easier. 
https://docs.google.com/Doc?id=df4f9hbq_46cs9f28fs&pli=1
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