In this dish video, Martha Stewart bakes an incredible gooey butter cake. This sticky-sweet cake comes from St. Louis with a serendipitous backstory. Legend has it that the cake was developed after a local baker made a mistake with his coffee cake dish, but the consumers loved it. Now, practically a century later on, bakeries all over Missouri have their own variation of the traditional local dessert. Martha makes her decadent sticky topping out of butter, sugar,…