For years, New Yorkers have relied on Milk Bar for their rainbow birthday cake needs and late-night dessert cravings. The flagship Flatiron sweets shop, which was initially a Momofuku offshoot and now has locations nationwide, is useful for picking up a personal cookie, a slice of their sweet, treacle-like pie, or their nostalgic cereal milk ice cream. Chances are we aren’t telling you anything you don’t know already.