Salmon mornay with potato and cauliflower mash

Salmon Mornay with potato and cauliflower mash combines creamy Mornay sauce with seared salmon and a smooth vegetable mash. This comforting dish is baked to golden perfection, making it ideal for family dinners or special occasions.

26 Nov 2025
Cook time 25 min
Prep time 40 min

Ingredients:

1/2 cup butter
2/3 cup all-purpose white wheat flour
3 cups milk (1% fat)
1/2 cup cheddar cheese
5 potatoes
1/2 cauliflower
2 tbsp chives
2 lb salmon
2 tbsp olive oil
1/3 cup bread crumbs

Salmon mornay with potato and cauliflower mash is a delightful and comforting dish that combines the creamy texture of a classic mornay sauce with the wholesome flavors of salmon, potatoes, and cauliflower. It's a wholesome meal that is perfect for family dinners or special occasions.

Instructions:

1. Prepare the Potato and Cauliflower Mash:
- In a large pot, place the diced potatoes and cauliflower florets. Cover with water and add a pinch of salt.
- Bring to a boil and cook until both potatoes and cauliflower are tender, about 15-20 minutes.
- Drain well and return to the pot. Mash until smooth. Set aside and keep warm.

2. Make the Mornay Sauce:
- In a medium saucepan, melt the butter over medium heat.
- Add the all-purpose flour and cook, stirring continuously, for about 1-2 minutes until the mixture turns a pale golden color.
- Gradually whisk in the milk, ensuring no lumps form, and bring the mixture to a boil. Continue to whisk until the sauce thickens, about 3-5 minutes.
- Reduce the heat to low and add the grated cheddar cheese. Stir until the cheese is fully melted and incorporated.
- Add the chopped chives and season with salt and pepper to taste. Remove from heat and set aside.

3. Cook the Salmon:
- Preheat the oven to 375°F (190°C).
- Heat the olive oil in a large skillet over medium-high heat.
- Add the diced salmon pieces to the skillet and sear for about 2 minutes on each side until they are just golden but not fully cooked through.

4. Assemble and Bake:
- In a large baking dish, spread the potato and cauliflower mash evenly at the bottom.
- Layer the seared salmon pieces on top of the mash.
- Pour the Mornay sauce evenly over the salmon and mash.
- Sprinkle the bread crumbs over the top to form a crust.

5. Bake:
- Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the top is golden and the sauce is bubbling.

6. Serve:
- Remove from the oven and let it rest for a few minutes before serving.
- Garnish with additional chopped chives if desired.

With its rich and creamy mornay sauce, tender salmon, and nutritious potato and cauliflower mash, this dish is sure to become a family favorite. Enjoy this hearty meal and savor the delicious blend of flavors and textures.

Salmon mornay with potato and cauliflower mash FAQ:

What is the best way to know when the salmon is done cooking?

The salmon is done cooking when it flakes easily with a fork and has reached an internal temperature of 145°F (63°C). Since it continues to cook slightly after being removed from the oven, it's safe to take it out just before reaching this temperature.

Can I use frozen salmon for this recipe?

Yes, you can use frozen salmon. Ensure it is fully thawed before cooking to allow for even cooking. Adjust the searing time slightly, as thawed salmon cooks faster.

What should I do if my Mornay sauce is too thick?

If your Mornay sauce becomes too thick, you can whisk in a little extra milk gradually over low heat until you achieve your desired consistency. Make sure to do this slowly to prevent making it too watery.

How can I store leftovers from this dish?

Allow leftovers to cool completely, then store them in an airtight container in the refrigerator for up to 3 days. You can reheat in the microwave or oven until warmed through.

Can I substitute the cheddar cheese with another type of cheese?

Yes, you can substitute cheddar cheese with a similar melting cheese, such as Monterey Jack or Gruyère. Keep in mind that this will slightly change the flavor profile of the dish.

Tips:

- Use fresh ingredients: To get the best flavors, use fresh salmon, potatoes, and cauliflower. Fresh ingredients will improve the overall taste and texture of the dish.

- Don't overcook the salmon: Salmon cooks quickly, so keep a close eye on it to prevent it from becoming dry. Aim for a moist and flaky texture.

- Prepare the mash first: Cook the potatoes and cauliflower and prepare the mash before you start with the mornay sauce and salmon. This will help streamline the cooking process.

- Consistency of the sauce: Ensure that your mornay sauce is smooth and lump-free. Stir constantly while adding the flour to the butter and gradually add the milk to prevent lumps.

- Cheese choice: Using a sharp cheddar cheese will give a more pronounced flavor to the mornay sauce. Feel free to experiment with other types of cheese for different flavor profiles.

Nutrition per serving

8 Servings
Calories 470kcal
Protein 33g
Carbohydrates 40g
Fiber 4.32g
Sugar 7g
Fat 24g

Salmon mornay with potato and cauliflower mash