Description

A creamy, savory Alaskan seafood casserole made with tender halibut fillets layered over sweet onions, topped with a seasoned sour cream-mayo mix and buttery breadcrumbs. A regional favorite that’s comforting, rich, and full of flavor.

Ingredients

Units Scale

1 1/2 lbs fresh halibut fillets
2 tablespoons lemon juice
1/2 teaspoon salt
1/4 teaspoon black pepper
1 large sweet onion, thinly sliced
1/2 cup mayonnaise
1/2 cup sour cream
1/2 teaspoon dried dill or parsley
1/2 teaspoon garlic powder
1 tablespoon chopped green onions or chives
1 cup seasoned breadcrumbs
2 tablespoons melted butter

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Instructions

Preheat oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
Place thinly sliced onions evenly on the bottom of the baking dish.
Layer halibut fillets over the onions. Drizzle lemon juice over the fish and season with salt and pepper.
In a medium bowl, mix together mayonnaise, sour cream, dill, garlic powder, and green onions. Spread this mixture over the halibut.
In a small bowl, combine breadcrumbs with melted butter and sprinkle over the creamy topping.
Bake uncovered for 30–35 minutes or until the fish flakes easily with a fork and the top is golden brown.
Let rest for 5 minutes before serving. Pair with roasted vegetables, salad, or rice.

Notes

Use fresh halibut for the best flavor and texture, but frozen (thawed) halibut works as well.
Adjust the seasoning to your preference—add a pinch of paprika or cayenne for extra depth.
This dish can be assembled a few hours in advance and baked just before serving.
Leftovers can be stored in the fridge for up to 2 days and reheated gently in the oven.

Nutrition

Serving Size: 1 serving
Calories: 410 kcal
Sugar: 3 g
Sodium: 520 mg
Fat: 28 g
Saturated Fat: 9 g
Unsaturated Fat: 17 g
Trans Fat: 0.5 g
Carbohydrates: 12 g
Fiber: 1 g
Protein: 32 g
Cholesterol: 95 mg