Easy Tuna Mornay

This easy tuna mornay recipe is a meal the whole family can enjoy every day of the week! Simple to make and on the table in less than 30 minutes. Totally gluten free and low carb friendly this is one recipe I am sure you will love!
Before jumping to the recipe please note that the below information contains HOT TIPS for this recipe. We try and answer all your questions to guarantee a perfect keto recipe every time.

Why You Will Love This Recipe

Comfort food – this canned tuna casserole is hearty and takes many of us back to our childhood.

Quick and easy – this tuna mornay without pasta uses simple ingredients, and is on the table in under 30 minutes.

Simple ingredients – all the ingredients are basic, regular pantry and fridge items.

Low carb – at only 5g net carbs per serve, this is an ideal low-carb and keto-friendly main meal.

Family-friendly! – This is a keto meal that will be enjoyed by the whole family.

Various cooking methods – I have included methods to air fry, grill, or oven bake. Thermal cooking methods for our Thermomix® users have been included for the sauce too.

What is Tuna Mornay?

A tuna mornay is a classic recipe that has been around for a very long time. In Australia Tuna Mornay has been a family favourite meal for many decades and served many different ways. I remember my mum making it with a tin of Campbells soup (maybe cream of celery or cream of mushroom).

It is also often referred to as tuna casserole, tuna pasta bake, baked tuna casserole or tuna pie. It is basically a cheesy tuna casserole often served with vegetables and pasta or rice to bulk it out to feed a family cheaply.

This version has no pasta or rice. The ingredients I have used are all gluten-free, and low carb keto friendly. You can add pasta, rice, vegetable noodles (eg. zoodles) as you prefer. It is simple and delicious and very versatile.

Similar Recipes include – Cauliflower Mac and Cheese / Keto Salmon Patties

The Ingredients

Scroll to the recipe card at the bottom for the quantity of each ingredient used and the full detailed recipe on how to cook tuna mornay! Keep reading for more details on the ingredients, substitutes and step by step instructions on how to make it.

Tuna Mornay Ingredients on a tiled background.

The ingredients used in a tuna casserole pasta bake can vary but here is what we use for this simple and quick version.

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.

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.

Variations

  • Swap tuna with canned salmon, chicken, bacon, or ground beef or sausage. Use marinara mix or even just all vegetable if you prefer.
  • for dairy free tuna casserole swap the cream for cauliflower soup or your favourite dairy free cream or milk alternative. Or use canned tomatoes instead. Another popular option is to make tuna casserole with mayonnaise. Mayonnaise adds a creaminess to a tuna casserole without the dairy. The cheese can be replaced with nutritional yeast.
  • Vegetables are easily swapped to anything you have on hand to keep it simple. Often served with peas, corn, pasta, rice or potatoes.
  • Add seasoning, spice, or more fresh herbs. The creamy tuna sauce would be perfect with our Ranch Seasoning, Italian Seasoning or even curried tuna casserole would be amazing!
  • Use leftover Christmas ham, rotisserie chicken, or turkey in place of turkey!
  • Crunchy Toppings – I used to do this with crispy baked cheese crumbled on top. Before I followed the keto lifestyle I used to top tuna bake with crisp chips crumbled on top. It was so good. So crispy cheese is a great alternative.

How to Make It

Step 1. Preheat the oven to 200℃ FAN/220°C STATIC/425°F. Heat the butter in a saucepan over medium heat (I use a skillet or cast iron pan that I can transfer to the oven). Sauté the onions and mushrooms.

Step 2. Add the zucchini and sauté for 1 minute.

Step 3. Add the tuna, cream, and cheese and cook stirring occasionally until it begins to thicken.

Step 4. Top with remaining cheese and bacon and bake for 10 minutes or until golden and crispy on top.

Step 5. Serve as is or serve with a side of grilled asparagus or broccoli.

Thermomix Tuna Casserole

I have also included a method to make tuna mornay in a Thermomix. I still finish off baking it in the oven but you could also steam it if you prefer and brown it with a butane torch.

I do tend to find that creamy based sauces dont reduce quite as much when cooking in a thermal cooker. You may need to extend the time in the oven to reduce the sauce (if you prefer). See the recipe card below for the full method and tips.

FAQS and Hot Tips

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.

Can I make tuna casserole in a slow cooker?

You sure can! You can mix all the ingredients into the base of a slow cooker or crockpot and cook o low for 3 hours. Turn the heat up to high before serving and top with cheese and bacon.

More Recipes To Try

If you love our low carb tuna casserole and want more cheap family meals then here are just a few.

  1. Beef Stew Recipe
  2. Devilled Sausages
  3. Keto Chicken Enchiladas
  4. Schweinshaxe – Bavarian Slow Cooked Pork Knuckle
  5. Easy Zucchini Slice

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Tuna mornay in a black cast iron pan on a tiled background.

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.
4.97 from 87 votes!
Prep Time: 7 mins
Cook Time: 20 mins
Total Time: 27 mins
Course: Dinner
Cuisine: Australian
Diet: Diabetic, Gluten Free
Recipe Category: Low Carb
Calories: 442kcal
Author: Megan Ellam
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Servings: 4 serves
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Ingredients

  • 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

Instructions

CONVENTIONAL METHOD

  • 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.

THERMAL METHOD

  • 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.

Notes

Ingredients
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.

Your Own Notes

Nutrition

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
Tried this recipe?Mention @meganellam or tag #madcreations!

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