Seafood Au Gratin Recipe
Seafood Au Gratin Recipe photo by Taste of Home

Seafood Au Gratin Recipe

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A seafood casserole is a ‘must’ for a bountiful buffet. My father was a fisherman, so we ate fish almost every day. Over the years, I’ve tasted many seafood dishes, but none better than this one. —Hazel McMullin, Amherst, Nova Scotia
TOTAL TIME: Prep: 30 min. Bake: 15 min.
MAKES:6 servings
TOTAL TIME: Prep: 30 min. Bake: 15 min.
MAKES: 6 servings


  • 4 tablespoons butter, divided
  • 2 tablespoons all-purpose flour
  • 1/8 teaspoon pepper
  • 1 cup chicken broth
  • 1/2 cup 2% milk
  • 1/2 cup grated Parmesan cheese, divided
  • 1/2 pound sea scallops
  • 1 pound haddock or cod fillets, cut into six pieces
  • 1-1/2 cups sliced fresh mushrooms
  • 1/2 cup shredded part-skim mozzarella cheese
  • 1/2 cup shredded cheddar cheese

Nutritional Facts

1-1/2 cup: 281 calories, 15g fat (9g saturated fat), 100mg cholesterol, 541mg sodium, 6g carbohydrate (2g sugars, trace fiber), 29g protein


  1. In a large saucepan, melt 2 tablespoons butter. Stir in flour and pepper until smooth; gradually add broth and milk. Bring to a boil; cook and stir 2 minutes or until thickened. Stir in 1/4 cup Parmesan cheese; set aside.
  2. Preheat oven to 350°. Place scallops in another saucepan; cover with water. Simmer, uncovered, 4-5 minutes or until firm and opaque.
  3. Meanwhile, place fillets in a shallow 2-qt. microwave-safe dish. Cover and microwave on high 2-4 minutes or until fish flakes easily with a fork. Drain scallops. Arrange fish and scallops in a greased 11x7-in. baking dish.
  4. In a small skillet, saute mushrooms in remaining butter until tender; stir into cheese sauce. Spoon over seafood. Sprinkle with mozzarella, cheddar and remaining Parmesan cheese.
  5. Cover and bake 15-20 minutes or until bubbly and cheese is melted. Yield: 6 servings.
Editor's Note: This recipe was tested in a 1,100-watt microwave.
Originally published as Seafood Au Gratin in Taste of Home October/November 2007, p41

Light-Bodied White Wine

Enjoy this recipe with a light-bodied white wine such as Sauvignon Blanc or Pinot Grigio.

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Reviewed Jul. 9, 2014

"What a dish! Although I substituted a few things. Here were my changes; used Red Mill all purpose gluten free flour vs. all purpose flour then added 2 tsp of Old Bay Seasoning along with freshly ground pepper. I only had raw shrimp, so after cleaning those up I sautéed them in the butter with two minced garlic cloves and the mushrooms. In the meantime I seasoned the cod with salt, pepper and Old Bay. However I did not cook the fish as specified in original recipe because the cod slices I had from Trader Joe's were too thin to cook in the microwave and oven. So I had the seasoned fish in the baking dish poured the sauce with the shrimp and mushrooms on top, added the mozzarella and baked for 18 minutes. What a fabulous dish. My whole family loved it. Thank you."

Reviewed Dec. 12, 2012

"Very good!!!"

Reviewed Aug. 31, 2012

"Very rich"

Reviewed Jun. 14, 2011

"One of the best seafood dishes we have ever eaten. Friends requested the recipe."

Reviewed Apr. 8, 2011

"I thought this recipe was very good and my dh liked it as well. I ended up using a pound of scallops instead of 1/2 lb. My only question is, why cook the scallops and cod prior to baking? It seems to me this is an unnecessary step and I think it toughens the scallops. Next time, I will bake only to see how it comes out. But it was still a great recipe, full of flavor."

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