M&S Food has unveiled two new cookie-inspired treats, both now stocked across its Foodhalls nationwide.The headline addition is the S'mores Cookie Cup, priced at £3, which is the retailer's debut bake-at-home cookie cup product.Drawing inspiration from the popular chilled Birthday Cake and Pistachio Big Daddy Cookie Cups, this oven- and air-fryer-compatible treat features an all-butter milk chocolate chunk cookie base designed to emerge golden-e…