M&S Deep Filled Chicken & Mushroom Puff Pastry Pie Butter enriched shortcrust pastry filled with succulent British chicken and mushrooms in a rich cream sauce topped with butter enriched puff pastry. Perfect served with carrot, swede and potato mash and runner beans. Oven cooks in 30 minutes. Serves 3. 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.