The easiest cake ever is: Austrian Plum Cake! Or, Zwetschgenkuchen. It’s not dump-and-stir, but it takes, like, 10 minutes to throw together. This is based on one of Chris Kimball’s all-time favorite cakes, from Austria; it’s usually a colder-weather cake (cakey-er, with rye flour and crumble), but we wanted something that bakes up light and puffy, acting more like an adhesive for the fruit. Mix five ingredients until they form a thick, almost spackle-like batter, arrange the plums, and that’s i