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individual cod mornay in a white oval dish.

Cod Mornay

Chunks of cod and king prawns are smothered in a creamy cheesy mornay sauce and baked in the oven. Perfect for weeknights!
4.82 from 16 votes
Prep Time 10 mins
Cook Time 20 mins
Total Time 30 mins
Course lunch, Main Course
Cuisine French
Servings 4
Calories 546 kcal


  • saucepan
  • wooden spoon
  • balloon whisk


  • 600 g cod skinless and boneless
  • 200 g king prawns shelled and deveined
  • 170 g Gruyère cheese
  • 50 g butter
  • 50 g flour plain or all purpose
  • 500 ml whole milk
  • 1 tablespoon chives fresh and chopped
  • ½ teaspoon ground black pepper


  • Preheat the oven to 180C/350F/160FAN/Gas4.
  • Divide the fish and prawns between the gratin dishes.
  • Heat the milk in a saucepan, over a medium heat, until it comes to a simmer then turn off the heat and transfer the milk to a jug.
  • Add the butter to the pan and heat until melted then tip in the flour and stir to combine for 1 minute.
  • Pour in a quarter of the milk to the pan, stirring all the time as the sauce comes together then add the rest of the milk.
  • Cook stirring until the sauce comes to a simmer and thickens, then cook for a further minute.
  • Take the sauce off the heat and add the pepper, half of the cheese and chives. Stir to combine and check the seasoning.
  • Divide the sauce evenly between the dishes and sprinkle with the remaining cheese.
  • Put the dishes on a baking tray and cook for 20 minutes until golden and bubbling.


The nutritional information provided is approximate and is calculated using online tools. Information can vary depending on various factors, but we have endeavoured to be as accurate as possible.


Calories: 546kcalCarbohydrates: 16gProtein: 52gFat: 30gSaturated Fat: 17gPolyunsaturated Fat: 2gMonounsaturated Fat: 8gTrans Fat: 1gCholesterol: 214mgSodium: 650mgPotassium: 897mgFiber: 1gSugar: 7gVitamin A: 1102IUVitamin C: 2mgCalcium: 629mgIron: 1mg
Keyword cheese sauce, cod, mornay sauce
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