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Seafood Au Gratin Recipe

Seafood Au Gratin Recipe

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. YIELD: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


  • 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.

Nutritional Facts

1-1/2 cups: 281 calories, 15g fat (9g saturated fat), 100mg cholesterol, 541mg sodium, 6g carbohydrate (2g sugars, 0 fiber), 29g protein.

Reviews for Seafood Au Gratin

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kmarqui User ID: 3651843 117109
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."

Jessei User ID: 6864119 147732
Reviewed Dec. 12, 2012

"Very good!!!"

vwgirl9 User ID: 6542372 163563
Reviewed Aug. 31, 2012

"Very rich"

Aula User ID: 1127835 162493
Reviewed Jun. 14, 2011

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

daduk User ID: 1648289 162492
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."

drose42 User ID: 4774527 208552
Reviewed Dec. 25, 2010

"Very good.I'm always looking for seafood recipes because my guys love to fish and we like imitation crabmeat-I know alot of people turn their noses up at it-but it is real fish and its inexpensive. I used it in this and it worked very well. I did add alittle extra cheese on top and ate in on brown rice. A keeper-will go on my short list of go to seafood meals."

brkornhaus User ID: 118422 67143
Reviewed Oct. 26, 2010

"This is fabulous! I used a whole pound of small scallops, which were a bit cheaper than than regular scallops. I used frozen cod and should have pressed some of the liquid out before cooking or perhaps drained it more thoroughly after cooking, as it made the sauce watery. Next time I'll do that - and double the recipe."

ashleigh34 User ID: 5022053 162491
Reviewed Apr. 4, 2010

"Omg...we LOVED this recipe. I substituted the cod for tilapia and I cooked the fish in a frying pan with a little olive oil and lemon pepper seasoning. I used the small scallops so I used 1 pound. I added 1/4 c.white wine to the cheese sauce. It was fantastic and I'm so glad to have found a different seafood recipe. Everyone loved it and it's a keeper!"

Joscy User ID: 2694585 168382
Reviewed May. 28, 2009

"We are so fortunate to have a friend whose career is as a fisherman. We live in Upstate New York, so when he comes visit, he supplies us with fresh frozen fish. Must try this recipe, very soon. Thank you for sharing!!"

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