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Tuna mornay in a black cast iron pan on a tiled background.
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4.97 from 89 votes!

Tuna Mornay

I hate tuna mornay, but I LOVE this dish. Tuna mornay without pasta and ready in under 30 minutes. Trust me, this is a tuna meal you will love.
Prep Time7 minutes
Cook Time20 minutes
Total Time27 minutes
Course: Dinner
Cuisine: Australian
Diet: Diabetic, Gluten Free
Recipe Category: Low Carb
Servings: 4 serves
Calories: 442kcal
Author: Megan Ellam


  • 2 tablespoons butter
  • 1/4 onion diced
  • 100 g mushrooms sliced
  • 200 g zucchini chopped or spiralised
  • 220 g thickened cream or heavy cream, see notes
  • 100 g mozzarella cheese
  • 400 g tinned/canned tuna
  • 1 rasher bacon cut into thin strips
  • 1 green onion or chives chopped
  • 1 tbsp parsley chopped



  • Preheat oven to 200℃ FAN/220°C STATIC/425°F.
  • Melt butter in an oven-safe pan over medium heat. Sauté onion and mushrooms until soft. Add zucchini and stir through. Add cream, half the mozzarella, and tuna. Stir until it begins to thicken. Season with black pepper.
  • Top with remaining cheese, and bacon. Transfer to oven; bake 8-10 minutes until golden. Top with green onions, chives, and parsley. Serve.


  • Preheat oven to 200℃ FAN/220°C STATIC/425°F.
  • Heat butter 2 min/100℃/speed 2.
  • Add onion and mushrooms; cook 5 min/120°C/reverse/speed 1. Add zucchini, and cream; cook 8 min/100°C/reverse/centre cap off/speed 1. Stir through half the mozzarella and add the tuna. Season with black pepper. Pour into a baking dish or cast iron pan.
  • Top with remaining cheese, and bacon. Transfer to oven; bake 8-10 minutes until golden. Top with green onions, chives, and parsley. Serve.


Tuna – I just use cheap canned tuna. You can use tuna in springwater, brine or oil. The choice is yours. Fresh tuna that has been cooked and flaked can be used if you prefer. Use canned salmon or chicken if you prefer.
This is a tuna casserole without pasta but of course you can use any pasta you like and mix through before baking. Our keto pasta recipe is perfect for this too.
Cream – thickened or heavy cream is best. See below for substitutions if you need a dairy free tuna mornay recipe.
Cheese – pre-shredded mozzarella, cheddar, or any sharp flavoured tasty cheese can be used. You can also substitute parmesan if you prefer.
Vegetables – I have used mushrooms and zucchini for the main vegetables. You can use any vegetables you have on hand like pumpkin, broccoli, spinach, cauliflower or just about anything. Honestly, this recipe is so flexible.
What to serve with tuna casserole? Serve with side salad or some grilled or steamed vegetables. 
How long can I store Tuna Casserole?
Keep in the fridge for 2-3 days.
Can tuna mornay be frozen?
You can freeze tuna casserole and thaw in the fridge overnight before reheating. This can be done before or after baking.
Tuna Mornay Thermomix instructions – I have included a thermal method and still bake in the oven. You can steam it if you prefer and use a butane torch to crisp up the top. 
You can also use your air fryer to air fry tuna casserole. Prepare up to topping with the cheese and bacon and then place into a dish that fits your air fryer. Bake for 5 minutes at 200°C.
I use a skillet or cast iron pan to cook the tuna bake over the gas before baking. This can then be a one pot meal without having to dirty up another baking dish!
This recipe yields approximately 4 servings. The actual number of servings will depend on your preferred portion sizes. 
To calculate the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe by 4. The result will be the weight of one serving. 
Nutritional values shown are a guideline only. They are for 1 serving using the ingredients listed. 
All recipes have been tested using all of the cooking methods included by various recipe testers.
You can freeze tuna casserole. Store it in the fridge for a max of 2-3 days or freeze in individual portions for simple lunches and dinners.
The recipe card instructions contain the most basic of steps and a list of ingredients. If you have any queries, questions or are unsure of substitutions, please scroll up to the blog post for more information.


Serving: 1serve | Calories: 442kcal | Carbohydrates: 6g | Protein: 28g | Fat: 34g | Saturated Fat: 21g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 9g | Trans Fat: 0.2g | Cholesterol: 137mg | Sodium: 478mg | Potassium: 518mg | Fiber: 1g | Sugar: 4g | Vitamin A: 1396IU | Vitamin C: 11mg | Calcium: 198mg | Iron: 2mg | Magnesium: 45mg | Net Carbs: 5g