Zack's Favorite Plum Buckle

Way back in 2016 I made this recipe (well, the full dairy version) and brought it into the office for a treat. That job gave me some of the best friends of my life, and I find myself today, making it again, for one of them. Back then, plum buckle became my colleague Zack&rsquo;s favorite baked good I&rsquo;d ever brought (possibly just because he was absolutely tickled by the name). To this day I…