"[Photograph: Carrie Vasios] We all know the best part of a coffee cake is the crumb, which is why there is a heap of sweet pecan streusel topping this moist banana cake. About the author: Carrie Vasios is the editor of Serious Eats: Sweets. She likes to peruse her large collection of cookbooks while eating jam from the jar. You can follow her on Twitter @carrievasios..."