Fishfinger Pie Ingredients: Fishfingers, Fresh Cream, Mushroom Soup Powder, 410g (1 Can) Tomato & Onion Mix, Grated Cheese Layer fishfingers in greased ovenproof dish. Spread the Tomato & Onion mix evenly over the fish fingers. Mix the cream and soup powder together & pour over fish fingers. Sprinkle grated cheese on top. Bake for 15 minutes at 180 degrees celsius.