Cod & Potatoes in Rosemary Cream Sauce

Cod and Potatoes in Rosemary Cream Sauce is an elegant one-pan dinner made with tender white fish, golden roasted potatoes, and a rich rosemary-infused sauce. Fresh lemon, tangy capers, Dijon mustard, and a touch of cayenne balance the creamy sauce and give the dish a bright, savory flavor.

I like serving this recipe when I want something comforting that still feels special. The cod cooks gently in the sauce, while the potatoes soak up all the flavors from the rosemary, garlic, lemon, and cream.

Why You’ll Love This Recipe

I love how this recipe turns simple ingredients into a complete and satisfying meal. The combination of flaky cod, tender potatoes, and velvety cream sauce makes every bite rich and comforting.

I also appreciate that most of the cooking happens in one baking dish. While the potatoes roast, I prepare the sauce on the stovetop, then combine everything for the final bake.

The lemon juice, lemon zest, capers, and Dijon mustard keep the cream sauce from feeling too heavy. I find that these bright, tangy ingredients complement the mild flavor of cod especially well.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

3 tablespoons extra-virgin olive oil, divided

1 pound Yukon Gold potatoes, cut into 1-inch pieces

2 teaspoons kosher salt, divided

1/4 teaspoon freshly cracked black pepper

2 tablespoons salted butter

1 large shallot, chopped

3 cloves garlic, minced

1 cup heavy cream

1/2 cup chicken stock or fish stock

2 sprigs fresh rosemary

1 teaspoon lemon zest

2 tablespoons lemon juice

2 teaspoons Dijon mustard

1/4 teaspoon cayenne pepper

2 tablespoons capers, drained

1 pound cod fillet, cut into 4 pieces

2 tablespoons chopped flat-leaf parsley

Directions

I preheat the oven to 450°F (230°C). I lightly grease an 8-by-8-inch baking dish with 1 tablespoon of olive oil.

I toss the potatoes with 1 tablespoon of olive oil, 1 teaspoon of kosher salt, and the black pepper. Then I spread them evenly in the prepared baking dish.

Next I roast the potatoes for 20 to 25 minutes, or until they are tender and beginning to turn golden around the edges.

While the potatoes roast, I heat the butter and remaining tablespoon of olive oil in a saucepan over medium heat.

I add the chopped shallot and cook it for about 5 minutes, stirring occasionally, until softened.

I stir in the minced garlic and cook for about 1 minute, just until fragrant.

Then I add the heavy cream, stock, rosemary sprigs, lemon zest, lemon juice, Dijon mustard, cayenne pepper, and capers.

I bring the sauce to a gentle simmer. I then reduce the heat and cook it for about 5 minutes, stirring occasionally, until it thickens slightly.

I season the cod pieces with the remaining teaspoon of kosher salt.

Next I remove the roasted potatoes from the oven and arrange the cod pieces among them.

I remove the rosemary sprigs from the sauce, then pour the sauce evenly over the cod and potatoes.

Then I return the baking dish to the oven and bake it uncovered for 10 to 15 minutes. The cod is ready when it is opaque and flakes easily with a fork.

I sprinkle the finished dish with chopped parsley and serve it immediately while the sauce is warm and creamy.

Servings and Timing

Servings: 4

Preparation time: 15 minutes

Cooking time: 35 minutes

Total time: 50 minutes

Estimated calories: 544 calories per serving

Variations

For a lighter sauce, I replace part of the heavy cream with additional stock. The sauce will be slightly thinner, but it will still have plenty of flavor from the rosemary, garlic, mustard, and lemon.

When cod is unavailable, I use another firm white fish, such as haddock, halibut, or pollock. I adjust the baking time according to the thickness of the fillets.

For extra vegetables, I add asparagus pieces, spinach, peas, or halved cherry tomatoes during the final stage of baking. I avoid overcrowding the dish so the fish cooks evenly.

For a stronger lemon flavor, I add a little more zest before serving. I prefer adding zest rather than too much extra juice because it brightens the dish without making the cream sauce overly acidic.

For a mild version, I leave out the cayenne pepper. For more warmth, I increase it slightly or add a small pinch of crushed red pepper flakes.

Storage/Reheating

I store leftovers in an airtight container in the refrigerator for up to two days. Because cooked fish is delicate, I refrigerate the dish as soon as it has cooled.

For the best texture, I reheat individual portions gently in a covered baking dish at 300°F (150°C) until warmed through. I sometimes add a small splash of stock or cream to loosen the sauce before reheating.

I can also reheat the dish in the microwave at reduced power in short intervals. I avoid overheating it because high heat can dry out the cod and cause the cream sauce to separate.

I do not usually freeze this dish. The potatoes can become grainy, and the cream sauce may separate after thawing.

Related Recipes:

• Baked Cod with Lemon and Garlic
• Lemon Butter Baked Cod
• Panko Parmesan Baked Cod

FAQs

How do I know when the cod is fully cooked?

I check whether the cod has turned opaque and flakes easily when gently pressed with a fork. The thickest part should reach an internal temperature of 145°F (63°C).

Can I use frozen cod?

I can use frozen cod after thawing it completely in the refrigerator. I pat the fillets dry before seasoning them so excess moisture does not dilute the cream sauce.

Can I prepare this recipe ahead of time?

I can roast the potatoes and prepare the sauce a few hours in advance. I refrigerate them separately, then assemble the dish with the raw cod shortly before baking. I may need to add a few minutes to the cooking time if the ingredients are cold.

What can I serve with cod and potatoes?

Because the recipe already contains fish, potatoes, and a rich sauce, I usually pair it with a simple green salad, roasted asparagus, steamed green beans, or sautéed spinach. A light vegetable side helps balance the creamy main course.

Why did my cream sauce separate?

A cream sauce may separate when it is boiled too aggressively or exposed to very high heat for too long. I keep the sauce at a gentle simmer and avoid overbaking the assembled dish. I also use full-fat heavy cream because lower-fat substitutes are more likely to separate.

Conclusion

Cod and Potatoes in Rosemary Cream Sauce is a comforting dinner with an elegant balance of creamy, savory, tangy, and herbaceous flavors. I love how the roasted potatoes absorb the rosemary sauce while the cod remains tender and flaky.

With minimal preparation and a total cooking time of about 50 minutes, I find this recipe practical enough for a weeknight meal yet impressive enough for a special dinner.

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