Haddock and Potatoes Recipe: Herbed Butter Crust Meets Silky Fish

This haddock and potatoes recipe transforms simple ingredients into a restaurant-worthy dish with tender fish and perfectly seasoned potatoes. The secret lies in a herbed butter crust that creates a crispy, golden finish while keeping the fish silky inside.

I developed this recipe after years of testing different techniques to balance flavors and textures—now it’s my go-to for weeknight dinners that feel special.

The potatoes are roasted until crispy on the edges and fluffy inside, while the haddock is pan-seared to maintain its delicate texture. A simple lemon-herb butter bastes the fish, adding brightness that cuts through the richness of the potatoes.

This method ensures every bite delivers a harmonious blend of crispy, creamy, and tender elements without requiring advanced skills.

By the time you plate this dish, you’ll have golden, herbed butter-coated potatoes alongside perfectly cooked haddock with a crispy crust. The lemon-infused butter ties everything together, creating a dish that’s both elegant and approachable. It’s the kind of meal that makes ordinary weeknights feel like a celebration.

Serve with a side salad or steamed green vegetables to round out the plate. The recipe scales easily for two or four, making it perfect for small gatherings or solo dinners. Let’s get cooking—this dish is simpler than it looks, but the results are undeniably impressive.

Ingredients for haddock potato

Twelve ingredients transform into a restaurant-worthy haddock and potatoes dish with crispy edges and silky centers.

The Yukon Gold potatoes are the foundation—fresh, firm, and vibrant—so avoid mealy varieties. Whole Foods or local farm markets often carry the best quality, though any reputable grocery store will suffice. For the haddock, skin-on fillets ensure a better texture; Trader Joe's and Costco typically stock high-quality frozen options that thaw beautifully. If using fresh, look for bright, translucent flesh with no fishy odor. The unsalted butter must be cold and cubed for the herbed crust to form properly—European-style butter like Plugrá works best for flavor and texture.

No Yukon Gold potatoes? Baby red potatoes or fingerlings work equally well—they roast faster and hold their shape. Substituting dried dill for fresh requires half the amount, but fresh delivers that bright, anise-like flavor. For the butter crust, vegetable shortening can replace butter if needed, though it lacks richness. The heavy cream adds a luxurious touch—full-fat only—but half-and-half in a pinch won’t ruin the dish. If you’re avoiding gluten, cornstarch can replace the flour for dredging the haddock, though the texture will differ slightly.

Store the potatoes and haddock separately in the fridge—potatoes for up to 5 days, haddock for 2 days if fresh, or 3 months frozen. The herbed butter mixture keeps in the fridge for up to 1 week if stored in an airtight container. For meal prep, roast the potatoes ahead and reheat at 350°F for 10 minutes—the haddock is best cooked fresh but can be prepped in advance (pat dry and season just before searing). Leftovers reheat beautifully in a 375°F oven for 8-10 minutes, though the crust may soften slightly.

Step-by-step instructions for herbed butter crust haddock with potatoes

This method delivers perfectly crispy potato skins and delicate, flaky haddock with a golden herbed butter crust.

Preheat your oven to 425°F. Cut the 2 lb Yukon Gold potatoes into 1-inch chunks, leaving the skins on for texture. Place them in a large bowl and toss with 2 tbsp extra-virgin olive oil, 1 tsp diamond crystal kosher salt, and ¼ tsp ground black pepper. Spread the potatoes evenly on two rimmed baking sheets, ensuring they don't overlap.

Roast for 25 minutes, stirring once halfway through, until the edges begin to brown and the potatoes are tender when pierced with a fork. This initial roast develops flavor and prevents soggy skins later. Remove from the oven and let cool slightly while you prepare the fish.

In a small bowl, combine 0.5 cup unsalted butter (cut into 1-inch cubes), 0.25 cup chopped fresh parsley, 2 tbsp chopped fresh dill, 4 minced garlic cloves, ½ tsp diamond crystal kosher salt, and ¼ tsp ground black pepper. Mix until fully incorporated, then shape into a log and chill for 10 minutes to firm up.

Pat the 2 whole fresh haddock fillets dry with paper towels—this ensures a crisp crust. Place them on a plate and season lightly with ½ tsp diamond crystal kosher salt and ¼ tsp ground black pepper. Dredge each fillet in 2 tbsp all-purpose flour, shaking off any excess. This creates a light barrier for even cooking.

Return the potatoes to the oven and roast for an additional 15-20 minutes until they're deep golden brown and crispy on the edges. In the last 5 minutes, increase the oven temperature to 450°F for extra crispiness. Remove the potatoes and set aside, keeping them warm.

While the potatoes finish, place the chilled herbed butter log on top of each haddock fillet, pressing gently to adhere. Return the fish to the oven and bake for 8-10 minutes until the butter melts, spreads evenly, and the fish flakes easily with a fork. The skin should be opaque and slightly crisp, while the flesh remains tender.

Zest and juice the 1 whole fresh lemon. In a small saucepan, combine 0.25 cup heavy cream, lemon zest, 1 tbsp lemon juice, and ½ tsp diamond crystal kosher salt. Bring to a gentle simmer over medium-low heat and cook for 3-4 minutes until slightly thickened. Remove from heat and stir in 1 tbsp lemon juice for brightness.

Divide the roasted potatoes among four plates, top each with a haddock fillet, and drizzle generously with the lemon cream sauce. Garnish with additional chopped fresh parsley and dill. Serve immediately while the fish is warm and the potatoes are crispy.

Pro cooking tips for haddock potato

Potato Roasting Mastery

For crispy, golden potato skins, I swear by the two-stage roast method. First, roast at 425°F for 25 minutes to develop flavor and tenderness—this prevents soggy centers. Then, crank the oven to 450°F for the final 5 minutes to create that perfect crust.

Use Yukon Gold potatoes cut into 1-inch chunks—their waxy texture holds up beautifully. 🥔

Haddock Searing Secrets

Pat the haddock bone-dry before dredging in flour—this creates a crisp crust instead of a soggy one. I like to use skin-on fillets because the skin adds texture and helps hold the shape.

For extra flavor, add 1 tsp lemon zest to the flour before dredging. The key is medium-high heat in a nonstick skillet—too hot, and the fish burns before cooking through. 🔥

Herbed Butter Magic

Chill the herbed butter mixture for 10 minutes before placing it on the fish—this ensures it stays put while baking. I like to use Plugrá European-style butter for its rich flavor, but any unsalted butter works.

For extra brightness, add 1 tsp lemon zest to the butter. Press the butter log firmly onto the fish so it melts evenly and creates a golden, flavorful crust.

Timing and Temperature

The fish is done when it reaches an internal temperature of 145°F—use a meat thermometer to avoid overcooking. I recommend baking the haddock at 400°F for 8-10 minutes after adding the butter. If the butter starts to brown too quickly, tent the fish with foil to prevent burning.

The potatoes should be deep golden brown and crisp on the edges—this means they’re ready to plate. ⏰

Lemon Cream Sauce Trick

Simmer the lemon cream sauce on medium-low heat to avoid curdling—high heat can break the emulsion. For extra tang, add 1 tbsp lemon juice at the end. I like to strain the sauce through a fine-mesh sieve to remove any zest bits, but it’s optional.

The sauce should coat the back of a spoon lightly—this ensures it clings to the fish and potatoes beautifully. 💫

Plating Like a Pro

Arrange the potatoes first, then place the haddock fillet on top at a slight angle for visual appeal. Drizzle the lemon cream sauce in a zigzag pattern over the fish and potatoes. Finish with a sprinkle of chopped parsley and dill for a pop of color and freshness.

Serve immediately—this dish is best enjoyed while the potatoes are still crispy and the fish is warm. 🍽️

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