This is a one-pan meal with fish baked in cream on top of a potato gratin with a golden crunchy topping. It’s a cross between a casserole, gratin and a pie. Fabulously cosy, rustic, oven baked fish recipe that’s effortless yet company worthy!
Creamy baked fish on potato gratin
This dish gives off very French-country vibes. Which, in hindsight, is rather unsurprising given it’s a recipe that our very own Chef JB just casually threw together one day. We ate it, loved it so much, declared it was “website-worthy” then proceeded to remake it…oh, I don’t know. Maybe 10, 12 times before we were fully happy with it and closed out all the “what ifs”?
Basically, it’s a creamy potato gratin, heavy on the leek (or onion), with fish that is baked on top at the same time, covered in a crunchy golden breadcrumb topping. So essentially, the breadcrumb topping acts as a lid, keeping everything steamy and succulent as the fish bubbles away in the creamy sauce while the gratin soaks up the tasty fish juices.
It’s just an all-out cosy dish of deliciousness!
Ingredients
Here’s what you need to make this:
Best fish
This recipe is best made with the more delicate white fish fillets that are around 2 cm (0.8″) thick. We don’t want fillets too thin else they will overcook. (UPDATE: Readers have made and loved it with salmon – read feedback in comments section!)
Our favourite fish to make this with is barramundi which is a popular Australian fish. Here are some more fish with similar cooking characteristics that will work great:
barramundi (pictured), John Dory, snapper, basa, jewfish, blue eye cod (trevalla), tilapia, cod, halibut, pollock, hake, and salmon (readers have tried and loved – see recipe comments!).
Remember, the shape of fish means that you get thick cuts from the main body as well as thin cuts from towards the tail. Opt for the thicker cuts, aiming for 2cm/0.8″ thick. Pictured above is barramundi which is a thicker fish so we used the tail.
Skin on or off? Either is fine, it really won’t affect the bake time. But the skin won’t be crispy. If this is a turn-off for you, just eat the flesh and leave the skin.
Fish to avoid
I recommend avoiding:
Fish that dry out easily when cooked – Like swordfish, tuna, bonito, kingfish, marlin, mackerel. Unless you’re extremely careful they can become dry inside so are very prone to overcooking in the oven. I feel these fish are (mostly) better in raw/rare form such as Ceviche, Poke Bowls, Tartare (also see Tuna Steak);
Oily, “fishy” fish – Like mullet and sardines (try this recipe for sardines!).
For the potato gratin and creamy sauce
And here’s what you need for the rest of the dish:
Potatoes – Floury (starchy) and all-rounder potatoes work best to achieve a lovely potato gratin flavour.
– Australia: the cheap dirt-brushed potatoes sold everywhere (called Sebago) are ideal
– US: Russet
– UK: Maris PiperLeek – Flavour base for the gratin. Feel free to substitute with a standard onion!
Garlic – Flavour base.
Chardonnay or other dry white wine – This gives the sauce depth of flavour. Without, it tastes more one dimensional and like it’s missing “something”. Chardonnay is my favourite but any dry white wine that’s not too sweet or too woody will work fine. Non alcoholic substitute – More vegetable stock.
Vegetable stock/broth – For semi braising the potatoes in a flavoured broth, tastier than using just water!
Butter – For pan sautéing the potatoes before finishing them off in the oven.
Panko, parmesan and olive oil – The crunchy topping!
How to make Creamy Fish on Potato Gratin
This is a one pan meal that starts off on the stove and is finished in the oven. It would be handy if the whole dish could just be done in the oven, but we tried and the flavour was not as good. Whereas using the stove-to-oven method makes it company-worthy good!
Crunchy topping – Mix the panko and olive oil together, then stir through the parmesan.
Sauté the leeks and garlic, then cook the sliced potatoes for 6 minutes or until they are partially cooked. During this step, the potatoes absorb the flavour of the leek and garlic which is what makes the gratin so good!
Braise the potatoes firstly in wine for 1 minute (simmer rapidly to almost fully reduce to cook out the alcohol) then the vegetable stock for 1 1/2 minutes until reduced by half.
Top with fish pieces (which we first sprinkle with salt and pepper). Then pour over the cream, aiming for as much coverage as possible.
Topping – Sprinkle the entire surface with the crunchy topping.
Bake for 30 minutes – I PROMISE THE FISH DOES NOT OVERCOOK!! You would think it does, but it doesn’t. All that creamy goodness under the breadcrumb topping keeps everything moist and succulent!
Broil/grill 4 minutes – Then to finish it off, I like to give it a quick 4 minute blast under the oven grill/broiler to give the topping lovely colour.
Rest 5 minutes – Place on the counter and let it rest for 5 minutes before serving. Don’t skip this step! This is when the juices in the fish gets reabsorbed into the fibres so when you cut into the fish, it stays in the fish flesh (and ends up in your mouth) rather than running out onto the plate.
What to serve with Creamy Fish on Potato Gratin
All you need to finish off this meal is a fresh, crisp salad to serve on the side. Just toss leafy greens in French Dressing, or if you’re cooking for company, try the French Bistro Salad. On theme with the French-ish vibes going on in this dish!
I also wouldn’t say no to some crusty bread for mopping the plate clean. And for dessert – anyone for a pile of fresh baked Madeleines? Fast becoming a go-to for dinner parties because the batter is made in advance (you can even freeze it!) and stored in piping bags or jugs. Then it literally takes 2 minutes to pipe into the pan and 10 minutes to bake. How good is that!!! – Nagi x
Suggested sides
Watch how to make it
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Creamy fish on potato gratin
Ingredients
- 4 x 160g/5oz white fish fillets , ~2cm / 0.8" thick, skinless (barramundi, snapper, tilapia, cod, salmon – Note 1)
- 1/2 tsp cooking/kosher salt
- 1/4 tsp black pepper
Potato gratin:
- 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 (Note 2)
- 3 garlic cloves , minced
- 2 medium starchy potatoes (250g / 8oz each), peeled (Note 3)
- 3/4 tsp cooking/kosher salt
- 1/2 tsp black pepper
- 1/2 cup dry white wine , any type, sub more veg stock (Note 4)
- 1/2 cup vegetable stock/broth , low sodium
- 1 cup thickened/heavy cream
Crunchy topping:
- 3/4 cup panko breadcrumbs
- 2 tbsp extra virgin olive oil
- 1/4 cup parmesan , finely shredded
Instructions
- Preheat the oven to 180°C/350°F (160°C fan) with a shelf in the middle.
- Potatoes – Cut the potatoes into quarters, then sliced 4mm / 1/6" thick. Place cut potato in a large bowl of water (prevents from going brown, removes excess starch so it cooks quicker). Drain before use.
- Crunchy topping: Mix panko and olive oil in a bowl. Then stir in parmesan.
- Season fish: Sprinkle salt and pepper on both sides of the fish fillets. Set aside.
- Sauté – Melt butter in a large oven-proof skillet (30cm/12") over high heat until foamy. Add leek and garlic, then cook for 3 minutes.
- Sauté potatoes – Add potato, salt and pepper. Cook for 6 minutes, stirring regularly. The potatoes should be half cooked at this stage.
- Reduce wine and stock – Pour in white wine. Simmer rapidly until it is mostly evaporated – about 1 minute. Pour in stock, then simmer for 1 1/2 minutes or until reduced by half.
- Top with fish – Turn the stove off. Place fish on top of the potatoes, presentation side up. (Note 1) Pour cream all over, aiming for full coverage. Sprinkle with panko breadcrumbs.
- Bake for 30 minutes – I know this sounds like a long time but the fish stays succulent!
- Colour topping – Switch to the oven grill (broiler) on high and move the skillet up to the top shelf. Grill/broil 4 minutes or until golden.
- Rest – Remove and rest for 5 minutes, then serve! Eat the fish and gratin together with each mouthful for maximum eating pleasure!!
Recipe Notes:
– Australia: the cheap dirt-brushed potatoes sold everywhere (called Sebago) are ideal
– US: Russet
– UK: Maris Piper 4. Wine adds more flavour into this dish but doesn’t make it taste winey because we cook the alcohol out. Substitute with more vegetable stock. Leftovers will keep for 3 days in the fridge. Not suitable for freezing. Nutrition per serving.
Nutrition Information:
Life of Dozer
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KezzaMcD says
We are not big fish eaters but this is so easy & delicious. Leftovers tasted even better!
Ellie says
Oh my goodness, This was seriously out-of-this-world delicious, like a fancy restaurant-quality meal. And the best part? It wasn’t even that hard to make! I followed the recipe step-by-step and it turned out perfect. Everyone who tried it loved it, even my little picky eater. I’ve never seen her eat so much of anything before! I can’t wait to make it again.
KKiszka says
Thank you for this recipe! Ultimate pleasure on a gloomy day;-) Easy and very aromatic – one of top ten fish recipes of the family – thanks!
Nora says
Nagi you are a great cook. I always love your recipes.
I want to add more veggies to this dish (celery, carrots, broccoli and cauliflower), when would you add these?
B says
Can this be frozen?
Noelle Coughlan says
This was devine!!
Robyn says
I made this and it was delicious
Definitely be making it again thank you Nagi
Tami S says
Ok, this is as amazing as everyone says! I used cod. But I think I would prefer a less dense fish but the flavors are amazing!
The family have demanded this be on rotation.
Another HUGE hit!
Kate says
YUM!!
Easy, tasty, I even messed up the crumb and it was still delicious. As someone who always has plenty of fish in the freezer this is another winner and both my kids devoured it
Tracey Hannigan says
One of the best recipes in 61 years of life Tweaked with some fresh dilll fennel bulb and capers Thank you Nagi and JB this is now on high rotation in our family
Sara Poulson says
Delicious. This is on regular rotation in our house.
Anita says
This is a stunning dish. So easy and tasty and great for a mid week meal. Special enough for a dinner party. My friend suggested adding some prawns and it was delish. I make it every couple of weeks .love it.
JK says
Easy, delicious & kids love it
Lesley Rayner says
I have made this recipe many times and it is the biggest hit with everyone I serve it up to. My favorite fish is monkfish. It holds together well, has great texture and flavour. I am not sure if it is available everywhere but it is also known as stargazer. Keep the recipes coming Nagi. I have introduced a lot of my friends to your website. Love your work
dorette Mc Pherson says
Hello Nagi!
The picture looked so good that I was going to make it. But before I do that I always have to see first what sweet Dozer is up to. I enjoy all the picture and the little notes you send of your cute furry child. t
Thank for that and for the great recipe!. It turned out perfect and – for the first time – even looked exactly like your picture! It was delicious. Thanks for another great recipe of yours that I have tried since I found your web side. Thank you for sharing.
Mandy says
This was amazing. We don’t eat a lot of fish but this was a perfect way to get myself & sons to eat more. We have made it a few times plus for family. Can be very economical if you find fish in the deli reduced too.
Can’t go wrong when it has potatoes!
Ned Browne says
This has gone into my Special Yummie Favourites file. Everyone loves it and it’s so very well explained!! As usual.
xxxxxx Ned
Peigi says
Another great dinner. Soo tasty thank you nagi px
Wendy says
You know you’re on a winner when your husband says “gee that was a lovely dinner tonight”. I used snapper and it was delicious. Thanks Nagi.
Kerrie says
I have made this dish a number of times and it is so delicious every time
I use pink snapper little expensive but so so good
Thank you for sharing 🙌🙌😋😋