This baked fish is a weeknight favorite for a reason.
As it cooks, the lemon-butter sauce gently bubbles and fills the kitchen with the freshest, coziest aroma.
You’ll love how effortlessly everything comes together in one dish.
Your reward is tender fish in a light, silky sauce that tastes far more special than the time it takes to make.
Serve it with a simple side or some warm crusty bread.
It’s an easy, comforting dinner everyone will want on repeat.
For the Baked Fish
- Fish Fillets – Use 4 fillets (150–180g each), about 1.5 cm / 1/2″ thick. Skinless and boneless works best, and this thickness helps them cook quickly and evenly in the oven.
- Unsalted Butter – The 50g / 4 tbsp butter melts into the cream and lemon, giving the sauce its silky richness.
- Cream (Heavy/Thickened) – Just 1/4 cup ads body without overpowering the delicate fish. This is what gives the sauce its light, velvety texture.
- Garlic – Freshly minced garlic (1–2 cloves) is essential for depth and aroma.
- Dijon Mustard – A tablespoon of Dijon sharpens the sauce and balances the creaminess beautifully.
- Lemon Juice – At 1 1/2 tablespoons, it brightens the entire dish and cuts through the richness.
- Salt & Pepper – Season both sides of the fish and the sauce. Simple but important for flavor.
- Eschallots (French Onion) – Finely chopped (1 1/2 tbsp). These add a mild sweetness and a subtle layer of flavor that rounds out the sauce.
- Parsley & Lemon Slices – Fresh parsley and lemon for serving add color and a touch of freshness to finish the dish.
Easy Baked Fish with Lemon Cream Sauce (One-Dish Meal)
A simple pan of fish fillets transforms into a bright, silky lemon cream dish with almost no effort. As the fish cooks, it releases just enough flavorful liquid to naturally enrich the sauce—no extra broth required.
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Servings: 4
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Ingredients
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4 x 150–180g / 5–6 oz fish fillets, about 1.5 cm / 1/2" thick, skinless and boneless (Note 1)
- 50g / 4 tbsp unsalted butter
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1/4 cup heavy/thickened cream (See Note 2 for alternatives)
- 1–2 garlic cloves, minced
- 1 tbsp Dijon mustard
- 1 1/2 tbsp lemon juice
- Salt & pepper
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1 1/2 tbsp eschallots (French onion), finely chopped (Note 3)
- Fresh parsley and lemon slices, for serving
- Heat the oven to 200°C / 390°F.
- Arrange the fish in a baking dish, leaving a little space between each piece. Season both sides with salt and pepper.
- In a microwave-safe jug or bowl, combine the butter, cream, garlic, mustard, lemon juice, and a pinch of salt and pepper. Microwave twice for 30 seconds, stirring between each burst, until the mixture is smooth and melted.
- Scatter the eschallots over the fish, then pour the warm sauce evenly across the fillets.
- Bake for 10–12 minutes, or until the fish is just cooked through. Move the fish to plates, spoon the pan sauce over the top, and finish with parsley and lemon wedges if you like.
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Choosing fish:
Fillets or cutlets/steaks around 1.5–2 cm thick work best because they cook quickly and stay tender.
Great options include Ling, Tilapia, Snapper, Barramundi, Silver Dory, John Dory, Basa, Hoki, Perch, and Flathead.
Very lean fish (like tuna or swordfish) can be used but monitor closely to avoid overcooking.
Avoid salmon (fat causes the sauce to split), extra-thin delicate fillets like Dover sole, or small whole fish.
If your fillets are thicker, the sauce may need a splash of water at the end to thin it slightly.
For frozen fish, thaw fully and pat dry—frozen fish releases more liquid, which may loosen the sauce (see Note 4). -
Cream swaps:
Evaporated milk works as a lighter option. If using light cream, add an extra 2 tsp Dijon mustard for richness. -
About eschallots:
Known as French onions in Australia and simply shallots in the US. You can substitute the white part of green onions or very finely minced regular onion. -
Sauce texture:
The sauce is meant to be light—not thick like gravy—but it shouldn’t be watery. The exact consistency varies depending on how much liquid your fish releases. To thicken, remove the fish and return the dish to the oven for a few minutes, watching closely.
- What’s the best fish to use for this recipe?
Any white fish fillets around 1.5 cm / ½” thick are perfect. They cook fast and stay beautifully juicy. Think tilapia, snapper, ling, basa — anything mild and flaky.
Avoid super-fatty fish (the sauce will split) and paper-thin fillets (they’ll overcook faster than you can blink!).
- Can I use frozen fish?
Absolutely — just make sure it’s fully thawed and patted very, VERY dry. Frozen fish tends to release extra liquid, and excess water = thin sauce.
Dry them well and you’re golden.
- How do I know when the fish is done?
Fish cooks quickly, so keep an eye on it. It’s ready when it flakes easily and looks opaque, not translucent.
For 1.5 cm thick fillets, 10–12 minutes is spot on. Don’t overthink it!
- My sauce came out a bit watery — help!
No stress. Different fish release different amounts of liquid. Simply remove the cooked fish, pop the dish back into the oven, and let the sauce bubble away for a few minutes.
It thickens fast — watch it like you would melted chocolate!
- What if I don’t have a microwave for the sauce?
Just melt everything gently on the stovetop over low heat. Same result, no microwave required.
Keep the heat moderate — we want a smooth creamy sauce, not scrambled cream.
