Cheddar-Crusted Fish Pie

First, preheat your oven to the desired temperature of 350 degrees Fahrenheit or 175 degrees Celsius.

Next, take a small amount of olive oil and coat the interior of an oven-safe dish. Place the white fish inside the prepared baking dish, then pour in enough milk to cover it partially.

Thus, boil a large quantity of salted water in another pot. Add the potatoes to this boiling water and continue cooking until they become tender enough to be pierced with a fork, which should take approximately 20 minutes.

Simultaneously, bake the fish in the preheated oven for a duration of 20 minutes. Remove it from the oven and carefully pour off the excess milk into a measuring container for future use; reserve this liquid for later incorporation into the potatoes. Increase the oven temperature to 425 degrees Fahrenheit or 220 degrees Celsius.

After that, drain the cooked potatoes and return them to their original pot. Place this pot on a stovetop burner, allowing any excess moisture from the potatoes to evaporate. Add butter, salt, and pepper to these potatoes, then mash them for a minute using a masher or spoon.

Then, gradually add the reserved milk to these mashed potatoes, stirring continuously until they achieve a smooth and creamy consistency. Finally, incorporate the thawed peas into these mashed potatoes with care to avoid damaging them.

Now, flake the white fish into small pieces within the prepared baking dish. Combine this with the flaked salmon and mix well to ensure an even distribution.

Following that, drop spoonfuls of the mashed potatoes onto the fish and spread them evenly to cover. Sprinkle shredded Cheddar cheese on top of these mashed potatoes.

Lastly, bake the fish and potato mixture in the oven for an additional 20 minutes.