Fillet of Flounder Au Gratin

Elevate your seafood dinner with this rich and irresistibly creamy Fillet of Flounder Au Gratin. Tender flounder fillets are bathed in a luxurious, homemade cheese sauce featuring Parmesan and Gruyère, then topped with a golden, crispy bread crumb crust that’s infused with fresh parsley and a hint of garlic. The delicate balance of a velvety roux-based sauce and the zesty brightness of lemon juice makes this dish both indulgent and refreshing. Perfect for a special occasion or an elegant weeknight treat, this baked flounder recipe is easy to prepare in just 40 minutes and pairs beautifully with a light salad or roasted vegetables for a complete meal. Whether you're a seafood lover or hosting guests, this decadent yet approachable flounder gratin will be the highlight of the table.

Nutriscore Rating: 59/100

Prep Time:15 mins

Cook Time:25 mins

Total Time:40 mins

Servings: 4

Ingredients

• 4 pieces flounder fillets
• 3 tablespoons butter
• 2 tablespoons all-purpose flour
• 1.5 cups milk
• 0.5 cups heavy cream
• 1 cup grated Parmesan cheese
• 1 cup grated Gruyère cheese
• 0.5 cups bread crumbs
• 2 tablespoons lemon juice
• 2 cloves garlic, minced
• 0.5 teaspoons salt
• 0.25 teaspoons black pepper
• 2 tablespoons fresh parsley, chopped
• 1 tablespoon olive oil

Directions

Step 1

Preheat your oven to 375°F (190°C). Grease a large baking dish with olive oil and set aside.

Step 2

Arrange the flounder fillets in the prepared baking dish in a single layer. Drizzle lemon juice evenly over the fillets and lightly season with salt and pepper. Set aside while preparing the sauce.

Step 3

In a medium saucepan, melt the butter over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant but not browned.

Step 4

Sprinkle the flour over the melted butter and whisk continuously for about 1 minute to form a roux.

Step 5

Gradually whisk in the milk and heavy cream, ensuring a smooth consistency. Cook, while stirring, for 3-5 minutes until the sauce thickens.

Step 6

Stir in the Parmesan and Gruyère cheeses, reserving about 1/4 cup of each cheese for the topping. Mix until the cheese is melted and the sauce is smooth. Remove from heat.

Step 7

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

Step 8

In a small bowl, mix the reserved cheeses with the bread crumbs and chopped parsley. Sprinkle this mixture evenly over the top of the sauce-coated fillets.

Step 9

Drizzle a small amount of olive oil over the crumb topping to help it crisp up in the oven.

Step 10

Bake in the preheated oven for 20-25 minutes, or until the topping is golden brown and bubbly, and the flounder is cooked through (it should flake easily with a fork).

Step 11

Remove from the oven and let it rest for a few minutes before serving. Garnish with additional fresh parsley, if desired, and serve warm.

Nutrition Facts

Serving size	1138.2 grams (1138.2g)

Amount per serving	% Daily Value*
Calories	2000

Total Fat 128.30g	164%
Saturated Fat 67.80g	339%
Polyunsaturated Fat 2.60g
Cholesterol 524mg	175%
Sodium 4530mg	197%
Total Carbohydrate 72.90g	27%
Dietary Fiber 3.50g	13%
Total Sugars 23.30g
Protein 129.30g	259%

Vitamin D 648IU	3239%
Calcium 1563mg	120%
Iron 6mg	32%
Potassium 1638mg	35%

*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: 58.8%

Protein: 26.3%

Carbs: 14.9%