Easy Flounder Au Gratin

Turn weeknight dinners into something truly special with this Easy Flounder Au Gratin recipe, a seafood lover's dream that’s as simple as it is indulgent. Featuring tender flounder fillets baked to perfection beneath a luscious, homemade cheese sauce made with Parmesan and Gruyère, this dish offers a delightful balance of creamy, zesty, and savory flavors. A golden, crumbly topping of seasoned bread crumbs and fresh parsley adds irresistible texture and aroma. Perfect for busy cooks, this recipe comes together in just 35 minutes and is ideal for serving alongside roasted vegetables or a crisp green salad. Whether you're looking to elevate your weeknight meals or impress guests with minimal effort, this baked flounder dish checks all the boxes.

Nutriscore Rating: 55/100

Prep Time:15 mins

Cook Time:20 mins

Total Time:35 mins

Servings: 4

Ingredients

• 4 pieces flounder fillets
• 3 tablespoons unsalted butter
• 2 tablespoons all-purpose flour
• 1 cup whole milk
• 3 ounces Parmesan cheese
• 1 cup Gruyère cheese, grated
• 1 cup bread crumbs
• 2 tablespoons lemon juice
• 1 teaspoon salt
• 0.5 teaspoons black pepper
• 2 tablespoons fresh parsley, chopped
• 1 tablespoon olive oil

Directions

Step 1

Preheat your oven to 400°F (200°C) and lightly grease a baking dish large enough to hold the flounder fillets in a single layer.

Step 2

Pat the flounder fillets dry with a paper towel, place them in the prepared baking dish, and drizzle with lemon juice. Season them with salt and black pepper. Set aside.

Step 3

In a medium saucepan, melt the butter over medium heat. Once melted, whisk in the flour to form a roux and cook for about 1 minute until it turns golden and fragrant.

Step 4

Slowly pour in the milk, whisking continuously to avoid lumps. Bring the mixture to a simmer and cook for about 2-3 minutes, or until thickened.

Step 5

Remove the saucepan from heat and stir in the Parmesan cheese and half of the Gruyère cheese. Mix until the cheese is melted and the sauce is smooth.

Step 6

Pour the cheese sauce evenly over the flounder fillets in the baking dish.

Step 7

In a small bowl, combine the bread crumbs, remaining Gruyère cheese, chopped parsley, and olive oil. Mix well until the crumbs are evenly coated.

Step 8

Sprinkle the breadcrumb mixture evenly over the cheese-covered flounder fillets.

Step 9

Bake the dish in the preheated oven for 18-20 minutes, or until the fish is fully cooked and flakes easily with a fork, and the topping is golden brown and bubbly.

Step 10

Remove from the oven, let cool for a few minutes, and serve warm with your favorite side dish, such as roasted vegetables or a fresh salad.

Nutrition Facts

Serving size	1064.8 grams (1064.8g)

Amount per serving	% Daily Value*
Calories	2235

Total Fat 129.20g	166%
Saturated Fat 66.70g	334%
Polyunsaturated Fat 1.60g
Cholesterol 490mg	163%
Sodium 5790mg	252%
Total Carbohydrate 107.30g	39%
Dietary Fiber 5.90g	21%
Total Sugars 21.60g
Protein 160.60g	321%

Vitamin D 594IU	2971%
Calcium 2511mg	193%
Iron 9mg	48%
Potassium 1615mg	34%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 52.0%

Protein: 28.8%

Carbs: 19.2%