Fish Fillet Thermidor

Indulge in the rich and elegant flavors of Fish Fillet Thermidor, a classic seafood recipe perfect for gourmet dining at home. This dish features tender white fish fillets, such as cod, haddock, or sole, smothered in a creamy, aromatic sauce made with dry white wine, heavy cream, Dijon mustard, and Parmesan cheese. Topped with golden breadcrumbs for a satisfying crunch, the fillets are baked to perfection, creating a bubbly, irresistible casserole-style entrée. With its lush texture and savory depth, Fish Fillet Thermidor is ideal for special occasions or dinner parties, and it pairs beautifully with fresh vegetables or a crisp green salad. Ready in under an hour, this surprisingly simple yet luxurious recipe is sure to impress seafood lovers and elevate your weeknight meals.

Nutriscore Rating: 62/100

Prep Time:20 mins

Cook Time:30 mins

Total Time:50 mins

Servings: 4

Ingredients

• 4 pieces white fish fillets (e.g., cod, haddock, or sole)
• 3 tablespoons butter
• 1 medium yellow onion, finely chopped
• 0.5 cup dry white wine
• 2 tablespoons all-purpose flour
• 1 cup milk, warmed
• 0.5 cup heavy cream
• 0.5 cup Parmesan cheese, grated
• 1 tablespoon Dijon mustard
• 2 tablespoons fresh parsley, chopped
• 1 tablespoon lemon juice
• 1 teaspoon salt
• 0.5 teaspoon black pepper, freshly ground
• 0.25 cup breadcrumbs

Directions

Step 1

Preheat your oven to 375°F (190°C) and lightly grease a baking dish large enough to fit the fish fillets in a single layer.

Step 2

Season the fish fillets with salt, pepper, and lemon juice. Set them aside for 10 minutes to marinate slightly.

Step 3

In a large skillet, melt 1 tablespoon of butter over medium heat. Sear the fish fillets for 1-2 minutes per side until lightly browned but not fully cooked. Remove fillets from the skillet and set aside.

Step 4

In the same skillet, melt the remaining 2 tablespoons of butter. Add the finely chopped onion and sauté until softened and translucent, about 3-4 minutes.

Step 5

Stir in the flour and cook for 1 minute, stirring constantly to create a roux. Gradually whisk in the white wine and warmed milk, ensuring no lumps remain.

Step 6

Bring the mixture to a gentle simmer, then stir in heavy cream, Dijon mustard, Parmesan cheese, parsley, and a pinch of salt and pepper. Cook for another 2-3 minutes until the sauce thickens.

Step 7

Place the seared fish fillets in the prepared baking dish. Pour the thickened sauce evenly over the fillets, ensuring they are completely covered.

Step 8

Sprinkle the breadcrumbs evenly over the top of the sauce for a crispy topping.

Step 9

Bake the dish in the preheated oven for 20-25 minutes, or until the fish is cooked through and the top is golden and bubbly.

Step 10

Remove from the oven and let rest for 5 minutes before serving. Garnish with additional parsley if desired. Serve warm with sides like steamed vegetables or a crisp salad.

Nutrition Facts

Serving size	1160.4 grams (1160.4g)

Amount per serving	% Daily Value*
Calories	1691

Total Fat 100.30g	129%
Saturated Fat 55.30g	276%
Polyunsaturated Fat 1.10g
Cholesterol 479mg	160%
Sodium 4429mg	193%
Total Carbohydrate 59.70g	22%
Dietary Fiber 3.90g	14%
Total Sugars 20.40g
Protein 111.40g	223%

Vitamin D 931IU	4654%
Calcium 906mg	70%
Iron 4mg	24%
Potassium 1934mg	41%

*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: 56.9%

Protein: 28.1%

Carbs: 15.0%