Cod Au Gratin

A creamy and indulgent dish that pairs delicate cod with a rich, cheesy sauce, topped with a crispy golden breadcrumb crust. Perfect for seafood lovers looking for a comforting, elegant meal, Cod Au Gratin is both sophisticated and satisfying. This baked fish casserole brings warmth and flavor to any dinner table, ideal for a cozy weeknight meal or a special occasion.

Why You’ll Love This Recipe

Cod Au Gratin combines the tender texture of flaky cod with the bold richness of a creamy cheese sauce and the satisfying crunch of a baked breadcrumb topping. It’s a one-dish meal that delivers gourmet flair with minimal effort. Whether you’re a seafood enthusiast or simply looking for a delicious way to enjoy white fish, this recipe stands out for its comforting elegance and ease of preparation.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

• cod fillets, skinless and boneless
• unsalted butter
• onion, finely chopped
• garlic, minced
• heavy cream
• whole milk
• shredded sharp cheddar cheese
• grated Parmesan cheese
• Dijon mustard
• salt
• black pepper
• breadcrumbs
• fresh parsley, chopped

Directions

1. Preheat your oven to 375°F (190°C). Grease a baking dish with butter or cooking spray.
2. In a skillet over medium heat, melt the butter. Add the chopped onion and minced garlic, sautéing until softened, about 3 minutes.
3. Stir in the heavy cream, milk, Dijon mustard, salt, and pepper. Bring to a simmer and cook for 3–4 minutes until the sauce slightly thickens.
4. Remove the pan from the heat and stir in the cheddar and Parmesan cheeses until melted and smooth.
5. Place the cod fillets in the prepared baking dish. Pour the creamy cheese sauce over the fish.
6. In a small bowl, combine the breadcrumbs with a tablespoon of melted butter. Sprinkle the breadcrumb mixture evenly over the dish.
7. Bake for 20–25 minutes, or until the cod flakes easily with a fork and the topping is golden brown.
8. Garnish with fresh parsley and serve immediately.

Servings and timing

• Servings: 4 servings
• Prep Time: 10 minutes
• Cooking Time: 25 minutes
• Total Time: 35 minutes
• Calories: Approximately 380 kcal per serving

Variations

• Add Vegetables: Incorporate sautéed spinach, mushrooms, or leeks into the cheese sauce for extra texture and flavor.
• Alternative Cheeses: Swap cheddar for Gruyère or Fontina for a different flavor profile.
• Low-Carb Option: Replace the breadcrumb topping with crushed pork rinds or a mix of grated Parmesan and almond flour.
• Spicy Kick: Add a pinch of cayenne pepper or a few dashes of hot sauce to the cheese sauce.
• Herb Blend: Experiment with thyme, dill, or tarragon for a more herbaceous profile.

Storage/Reheating

Storage: Let the dish cool completely, then store leftovers in an airtight container in the refrigerator for up to 3 days.

Reheating: Reheat in a 350°F (175°C) oven for 10–15 minutes until heated through. Avoid using the microwave, as it can make the fish rubbery and the topping soggy.

FAQs

What type of cod is best for Cod Au Gratin?

Fresh or frozen Atlantic cod fillets work best. Ensure they are boneless and skinless for ease of preparation and best texture.

Can I use frozen cod?

Yes, but thaw it completely and pat it dry before baking to prevent excess water from thinning the sauce.

Is this dish suitable for freezing?

It’s best enjoyed fresh, but you can freeze it before baking. Cover tightly and freeze for up to 2 months. Bake directly from frozen at 375°F for 45–50 minutes.

What can I use instead of cod?

Haddock, pollock, or halibut are good alternatives that maintain a similar flaky texture.

Can I prepare Cod Au Gratin ahead of time?

Yes, assemble the dish up to a day in advance, cover, and refrigerate. Bake when ready to serve.

Is this recipe gluten-free?

No, but it can be made gluten-free by using gluten-free breadcrumbs and checking labels on mustard and cheeses.

What side dishes pair well with Cod Au Gratin?

Serve with steamed green beans, roasted asparagus, or a light salad to balance the richness of the dish.

Can I use light cream instead of heavy cream?

Yes, though the sauce will be slightly less rich. Avoid using milk alone, as it may not thicken properly.

How do I know when the cod is fully cooked?

The fish should flake easily with a fork and reach an internal temperature of 145°F (63°C).

Why is my sauce curdled or separated?

Overheating or boiling the cheese sauce can cause it to split. Keep the heat moderate and stir gently when adding the cheese.

Conclusion

Cod Au Gratin is a refined yet comforting dish that transforms a simple piece of fish into an elegant meal. With its luscious cheese sauce and golden crust, it’s sure to impress at the dinner table while remaining easy to prepare. Whether for a weeknight indulgence or a dinner party centerpiece, this recipe offers a satisfying and memorable dining experience.

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