1 (14.75 ounce) can skinless, boneless salmon, drained and flaked
Instructions
Preheat the oven to 350 degrees F (175 degrees C).
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.
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.
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).
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.
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.