Advertisement oop Skip to Content The trick is to bang the baking sheet against the oven rack so the cookies flatten and the edges take on ridges • • Pan-banging chocolate chunk cookies. This cookie recipe is a wonderful pick by one of my favourite cooking teachers, Marlene Gray from Palm Desert, Calif. The trick is to bang the baking sheet against the oven rack so the cookies flatten and the edges take on ridges. We apologize, but this video has failed to load.