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Fish and Mash Casserole

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PREP TIME
15 min
COOKING TIME
60 min
TOTAL TIME
75 min
SERVINGS
6 servings
Dinner Irish
Fish and Mash Casserole
Ingredients
  • 1 pound cod fillets, cut into chunks
  • 3 tablespoons butter
  • 2 1/2 tablespoons all-purpose flour
  • 1 1/2 cups warm milk, or more as needed
  • 1 cup shredded sharp white Cheddar cheese
  • 1 (10 ounce) package frozen chopped spinach, thawed and drained
  • 1/2 cup minced onion
  • 1 teaspoon salt, or to taste
  • 1/2 teaspoon ground black pepper, or to taste
  • 1 clove garlic, pressed
  • 2 cups mashed potatoes
  • 1 cup shredded yellow Cheddar cheese
Instructions
1
Preheat the oven to a hot temperature of 375 degrees Fahrenheit (or 190 degrees Celsius).
2
Arrange cod fillets in a single layer on a large baking tray; set it aside for now.
3
Melt butter in a saucepan over low to medium heat. Combine the melted butter with flour, stirring until it forms a smooth paste-like consistency and turns light golden brown, taking around 2 to 5 minutes.
4
Gradually pour in warm milk into the flour mixture, stirring constantly as it comes to a gentle simmer over low heat. Continue whisking until the sauce thickens and becomes smooth, approximately 5 minutes.
5
Mix in grated white Cheddar cheese with the sauce, then combine it with sautéed onion, spinach, salt, and black pepper.
6
Remove the saucepan from heat and stir in minced garlic. If the sauce becomes too thick, add a little warm milk at a time until you reach your desired consistency.
7
Pour the sauce over the cod fillets in the baking dish, followed by a layer of mashed potatoes on top.
8
Bake the fish in the preheated oven for 30 minutes, then sprinkle some yellow Cheddar cheese on top. Continue baking until the fish is easily flaked with a fork, taking around 15 to 20 minutes more.