This is a great family-style dessert that's easy to make and will feed about 10 hungry people. My favorite way to serve it is as pictured: plop ice cream scoops on top and then give everyone a fork. Somehow the cookie tastes even better when everyone is standing around the stove top, hovering over the skillet for a bite. The cookie also slices neatly into triangles, and it goes without saying that people with better manners could serve it on plates at the dinner table.
The combination of warm peanut butter-oatmeal cookie with melting vanilla ice cream on top is seriously amazing. The cast iron skillet gives the cookie chewy edges while the center remains soft, but if you don't have a cast iron skillet a 10-inch round cake pan will work just fine.
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