Description

This Creamy Fish on Potato Gratin is the perfect blend of tender, flaky fish layered over garlicky, buttery potatoes, all baked in a rich, creamy sauce and topped with a golden, crispy parmesan crust. A comforting, one-pan meal that’s both elegant and easy to make!

Ingredients

For the Potato Gratin:

Unsalted butter – Adds richness and depth.
Leeks (or onions) – Mild sweetness to complement the creaminess.
Garlic – Enhances the flavor with a fragrant touch.
Starchy potatoes – The base of the gratin, becoming soft and creamy as they bake.
Salt & black pepper – Essential seasonings.
Dry white wine – Adds a subtle depth of flavor (or substitute with more vegetable broth).
Vegetable stock – Helps tenderize the potatoes and build flavor.
Heavy cream – The key to that luxuriously creamy sauce.

For the Crunchy Topping:

Panko breadcrumbs – Creates a light, crispy texture.
Extra virgin olive oil – Helps toast the breadcrumbs to golden perfection.
Parmesan cheese – Adds an umami, salty crunch.

For the Fish:

White fish fillets – Mild, flaky, and perfect for soaking up the rich flavors.
Salt & pepper – Simple seasonings to enhance the fish.

Instructions

1️⃣ Preheat & Prep:

Preheat oven to 180°C/350°F (160°C fan).
Slice potatoes thinly and soak them in water to prevent browning.

2️⃣ Make the Crunchy Topping:

Mix panko breadcrumbs, parmesan, and olive oil in a bowl. Set aside.

3️⃣ Sauté the Aromatics:

Melt butter in an ovenproof skillet.
Add leeks (or onions) and garlic, sautéing for 3 minutes.

4️⃣ Cook the Potatoes:

Add potatoes, salt, and pepper, cooking for 6 minutes while stirring.

5️⃣ Reduce the Wine & Stock:

Pour in white wine, simmer until mostly evaporated.
Add vegetable stock, simmer for 1½ minutes.

6️⃣ Assemble & Bake:

Turn off heat and place fish fillets on top of the potatoes.
Pour heavy cream all over.
Sprinkle panko topping evenly.
Bake for 30 minutes until bubbling.

7️⃣ Broil for the Perfect Golden Crust:

Switch oven to broil/grill on high for 4 minutes until topping is golden.

8️⃣ Rest & Serve:

Let it rest for 5 minutes before serving.

Notes

Best Potatoes: Use starchy potatoes (Russet or Yukon Gold) for a creamy texture.
Want More Crunch? Sprinkle extra parmesan before broiling.
Make It Dairy-Free: Substitute heavy cream with coconut cream.
Storage: Store leftovers in the fridge for up to 3 days or freeze for up to 2 months.

Nutrition

Serving Size: 1 serving
Calories: 420 kcal per serving
Sugar: 4g
Sodium: 480mg
Fat: 22g
Saturated Fat: 10g
Unsaturated Fat: 10g
Trans Fat: 0g
Carbohydrates: 38g
Fiber: 4g
Protein: 28g
Cholesterol: 65mg

Keywords: creamy fish gratin, fish and potato bake, one-pan fish dish, baked fish with cream, French-style gratin, comfort food recipe, seafood casserole