M&S Breaded Buttermilk Chicken Tenders Succulent and tender 100% chicken breast fillets in a crunchy buttermilk coating. Oven cooks straight from frozen in 20 to 25 minutes for ease. Serves 4. 100% of M&S Select Farms products meet our high quality and environmental protection standards. We know and trust all our Select Farmers, so you can trust M&S for your fresh food.