Name: Creamy Fish on Potato Gratin with Crunchy Parmesan Breadcrumb Topping Recipe
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: French-style
Ingredients: 4 x 160g/5oz white fish fillets, ~2cm / 0.8" thick, skinless (barramundi, snapper, tilapia, cod, salmon); 1/2 tsp cooking/kosher salt; 1/4 tsp black pepper; 3 tbsp / 50g unsalted butter; 2 large leeks, white and pale green part only, washed, cut in half lengthways, sliced 5mm / 0.2" thick OR 2 onions; 3 garlic cloves, minced; 2 medium starchy potatoes (250g / 8oz each), peeled; 3/4 tsp cooking/kosher salt; 1/2 tsp black pepper; 1/2 cup dry white wine (any type, or substitute with more vegetable stock); 1/2 cup vegetable stock/broth, low sodium; 1 cup thickened/heavy cream; 3/4 cup panko breadcrumbs; 2 tbsp extra virgin olive oil; 1/4 cup parmesan, finely shredded

Jump to Recipe· 3.8 from 27 reviews

If you’re seeking a meal that brings luxurious comfort to your table without fuss, the Creamy Fish on Potato Gratin with Crunchy Parmesan Breadcrumb Topping Recipe is your new best friend. This French-inspired dish combines silky baked fish nestled atop tender, buttery potato gratin, all bathed in a rich, creamy sauce. The pièce de résistance is a golden, crunchy Parmesan breadcrumb topping that adds texture and depth to every bite. It’s a perfect one-pan wonder that is both elegant enough for dinner guests and cozy enough for any night you crave something truly special.

Ingredients You'll Need

The image shows a close-up of a creamy baked dish in a white pan, with a golden brown crispy top layer made of breadcrumbs sprinkled with small green herbs. Below the crispy layer, there is a soft, creamy layer with tender chunks of white vegetables mixed in a thick, pale sauce. A woman’s hand is using a metal fork to lift a scoop of the creamy middle layer, revealing its smooth and slightly chunky texture underneath the crust. The dish sits on a white marbled surface photo taken with an iphone --ar 4:5 --v 7

This recipe shines because of its straightforward, wholesome ingredients. Each element is carefully chosen to create a harmony of flavors, from the delicate fish to the creamy potatoes and that unbeatable crunchy topping. Nothing fancy, just quality components working their magic together.

White fish fillets (4 x 160g/5oz): Choose firm, thick fillets like barramundi or cod for perfect flaky texture.
Cooking/kosher salt (½ tsp): Enhances every ingredient’s flavor subtly without overpowering.
Black pepper (¼ teaspoon + ½ tsp): Adds mild heat and depth to both fish and potatoes.
Unsalted butter (3 tbsp/50g): Adds richness and helps soften the leeks and potatoes while sautéing.
Leeks (2 large): Provides a sweet, mild onion flavor that pairs beautifully with creamy textures.
Garlic cloves (3, minced): Brings aromatic warmth and layers of flavor.
Starchy potatoes (2 medium): Ideal for a silky gratin that holds its shape but remains tender.
Dry white wine (½ cup): Adds a subtle acidity that balances richness.
Vegetable stock (½ cup, low sodium): Deepens the sauce’s complexity without excess salt.
Thickened/heavy cream (1 cup): Makes the sauce luxuriously silky and indulgent.
Panko breadcrumbs (¾ cup): Provide that coveted airy crunch on top.
Extra virgin olive oil (2 tbsp): Binds the topping and gives it a golden color and healthy fats.
Parmesan (¼ cup, finely shredded): Sharp, nutty notes that bring out the best in the crunchy topping.

How to Make Creamy Fish on Potato Gratin with Crunchy Parmesan Breadcrumb Topping Recipe

Step 1: Prepare the Potatoes

Start by slicing your peeled starchy potatoes thinly—about 4mm thick—so they cook evenly and absorb all the wonderful flavors. Soaking the slices in water removes excess starch, preventing them from sticking and helps speed up cooking.

Step 2: Mix the Crunchy Topping

Combine panko breadcrumbs with olive oil, tossing gently to coat every crumb. Stir in freshly grated Parmesan, which will add an irresistible golden crust once baked. Setting this aside early lets the flavors meld.

Step 3: Season the Fish

Lightly season the fish fillets with salt and pepper on both sides. Keeping it simple here allows the fish to remain the star without overpowering the creamy gratin beneath.

Step 4: Sauté Aromatics and Potatoes

In an oven-proof skillet, melt butter until foamy, then gently cook the sliced leeks and minced garlic until softened and fragrant—about three minutes. Add your drained potatoes with salt and pepper and cook for six minutes while stirring regularly. This partial cooking ensures tender potatoes once baked.

Step 5: Reduce Wine and Stock

Pour in the white wine and let it simmer rapidly until almost evaporated, about one minute. Follow with vegetable stock, allowing it to reduce by half. This concentrates flavors, keeping the sauce rich but not watery.

Step 6: Layer the Fish and Cream

Turn off the heat. Nestle the seasoned fish fillets presentation side up atop the potato mixture. Pour thickened cream over the entire skillet, ensuring the fish and potatoes are well covered for that signature creamy texture.

Step 7: Add the Parmesan Breadcrumb Topping

Sprinkle the panko and Parmesan mixture evenly across the top. This topping acts like a lid, sealing in moisture while providing that mouthwatering crunch and golden color later in the oven.

Step 8: Bake and Finish Under the Grill

Bake in a preheated 180°C (350°F) oven for 30 minutes. This slow bake keeps the fish succulent and lets the gratin bubble beautifully. Then switch to the grill setting and broil for 4 minutes or until the topping turns irresistibly golden brown. Allow the dish to rest for five minutes before serving.

How to Serve Creamy Fish on Potato Gratin with Crunchy Parmesan Breadcrumb Topping Recipe

The image shows a skillet dish with several layers starting at the bottom with thinly sliced light cream-colored potatoes in a creamy white sauce. Above that, there are pieces of white cooked fish partially covered by a layer of melted golden-brown cheese with a slightly crispy texture. The cheese layer is sprinkled with small bits of green herbs, adding color contrast. A silver fork is stuck into the dish on the right side, lifting a portion to show the layers underneath. The skillet is placed on a white marbled surface with a white cloth underneath. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

A sprinkle of fresh chopped herbs like parsley or chives adds a burst of color and freshness that contrasts perfectly with the rich, creamy flavors of your dish.

Side Dishes

This recipe is a complete meal in itself but pairs wonderfully with a crisp green salad dressed lightly with lemon vinaigrette or steamed seasonal vegetables to add some brightness and crunch.

Creative Ways to Present

Serve this gratin straight from the skillet for a rustic charm that invites sharing, or plate individual portions garnished with microgreens for an elegant touch that will impress guests at your next dinner party.

Make Ahead and Storage

Storing Leftovers

Keep any uneaten gratin in an airtight container in the refrigerator for up to 2 days to maintain freshness and avoid sogginess in the topping.

Freezing

You can freeze leftovers, though the crunchy topping may soften slightly upon thawing. Wrap tightly and store for up to one month. Defrost overnight in the fridge before reheating.

Reheating

Reheat gently in a moderate oven (around 160°C/320°F) to warm through and crisp the topping again. Avoid microwave reheating if you want to retain texture.

FAQs

Can I use other types of fish for this recipe?

Absolutely! While firm white fish like barramundi or cod are ideal for their texture, you can experiment with salmon or tilapia—just watch cooking times carefully, especially for thinner fillets.

Is it possible to make this recipe dairy-free?

You can substitute the cream with coconut cream or a plant-based cream alternative and use vegan butter. For the Parmesan topping, consider nutritional yeast mixed with panko for a cheesy flavor.

Can I prepare parts of this recipe in advance?

Yes, you can slice the potatoes and prepare the breadcrumb topping ahead of time. Assemble the dish right before baking to ensure freshness and best texture.

What if I don’t have an oven-proof skillet?

If your skillet isn’t oven-safe, transfer the sautéed potato mixture into a baking dish before adding the fish and cream. Just remember to adjust the baking time slightly as needed.

How can I make the topping extra crispy?

Make sure to toss the panko with enough olive oil to coat evenly. Broiling at the end is key for creating that signature golden crunch, so don’t skip that step.

Final Thoughts

This Creamy Fish on Potato Gratin with Crunchy Parmesan Breadcrumb Topping Recipe is a true delight, a comforting yet elegant dish that’s surprisingly easy to make. Whether you’re cooking for loved ones or just treating yourself, it’s a meal that brings warmth and satisfaction in every bite. Give it a go and discover how simple ingredients come together to create something truly unforgettable.