In a medium bowl, combine the graham cracker crumbs, sugar, and butter. Spoon the crumbs into the jars.
With an electric mixer on medium speed, beat together the yogurt, cream cheese, honey, vanilla, and lemon zest for 2-3 minutes or until creamy. Divide evenly among the jars. Spoon the jam on top of the filling in each jar. Screw on the lids and refrigerate for at least 2 hours or up to 12 hours before serving.