Fish Pie with Mashed Potato Topping

1 . Stage

Preheat the oven to 350 degrees F (175 degrees C).

2 . Stage

Oil an oven-proof baking dish with 1 teaspoon olive oil. Place white fish in the baking dish and pour in enough milk to cover the fish halfway.

3 . Stage

Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until fork-tender, about 20 minutes.

4 . Stage

While the potatoes are cooking, bake fish in the preheated oven for 20 minutes. Remove from the oven and drain off milk into a liquid measure; reserve for potatoes. Increase the oven to 425 degrees F (220 degrees C).

5 . Stage

Drain potatoes and return to the pot. Place on the stove to evaporate any extra water. Add butter, salt, and pepper and mash potatoes for 1 minute. Add reserved milk, a little at a time, and keep mashing until smooth and creamy. Gently stir in thawed peas, being careful not to crush them.

6 . Stage

Flake white fish into small pieces in the baking dish. Add flaked salmon and stir to evenly disperse. Drop spoonfuls of mashed potatoes on top of the fish; spread evenly to cover. Sprinkle Cheddar cheese on top.

7 . Stage

Bake in the oven for 20 more minutes.