I like the skillet idea. Does it have to be a cast iron skillet?
I've only made these cookie bars using a cast iron skillet so I can't vouch for or recommend using any other type of frying pan to make a skillet chocolate chip cookie. Most frying pans are designed for stove top cooking such as browning, sauteing or frying and not all of them are oven safe. Cast iron is different, it holds and distributes the heat beautifully and can pretty much handle anything from an open fame, to charcoal, to the heat of the oven. Another plus of a cast iron skillet - if cared for properly, it will last for generations. Talk about a great investment!