M&S Creamy Mushroom Sauce 200gM&S Creamy Mushroom Sauce. Smooth and rich, this creamy mushroom sauce is made with white wine and chicken stock. Heat gently over the hob or in the microwave and pour over grilled meat or chicken. Serves 2. Ingredients Mushrooms (33%), Double Cream (Milk) (20%), Chicken Stock (Water, Yeast Extract, Chicken Fat, Chicken Bones, Salt, Chicken), Whole Milk, White Wine (8%), Onions, Butter (Milk), Cornflour, Lemon Juice, Brandy, Salt, Garlic Pure, Thyme,