I honestly think this isn't so much a 60th Anniversary food, as it is an indication that they're trying to clear out the souvenir containers that say "60th Anniversary" on them.
In terms of actual food items created for the the 60th Anniversary, there is a cupcake at the Jolly Holiday Bakery (and probably elsewhere), along with all of the treats available at the candy shops (e.g., caramel apples, cake pops, rice crispie treats, etc.). There is also a specialty chocolate cake (I saw it at the Plaza Inn, French Market, and a few other CS locations). There were a few alcoholic drinks as well.