Keto Tuna Casserole with Salty Bacon & Cheese

A delicious keto tuna casserole that is a huge family favourite meal.
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.

Mad Creations Keto Tuna Casserole with Salty Bacon Crust, is an inexpensive and timeless family favourite that everyone can still enjoy while following a Ketogenic Diet.

This recipe is featured in my extremely popular limited edition book #ketobudget 

Our keto tuna mornay was added to a vote of popular recipes to create in a budget style for the family.  Tuna Casserole came out as a huge winner, and even more so when it was again voted as my first FREE recipe to featured out of the book. 

Plus it is easily the most commented and recommended recipe by everyone that has made it to date. 

It also seems tuna hating kids and hubbies absolutely love it and vote with licking their plates clean.  I guess that means this tuna mornay is pretty good.

tuna casserole in black bowl

How to Make It

Tuna Casserole is such an easy recipe. Even with this one it is easy to change it up to your personal taste. 

Swap mushrooms for zucchini or celery if you are not a fan..

If you don’t eat tuna, swap it out for chicken, bacon or ham. 

For more vegetables in the casserole add your favourite ones in. Plus if you are like me and need a bit of heat add some chillies and lots of cracked pepper.   

If you love this recipe please comment below let other know how you got on with it!

Want more Cheap and Easy Recipes?

If you love our keto tuna casserole and want more low carb casseroles or cheap meals then try a few of these in your weekly keto meal plans.

  1. Buttery Beef Casserole with Dumplings
  2. Instant Pot Mexican Shredded Chicken
  3. Delicious Keto Beef Lasagne
  4. Schweinshaxe – Bavarian Slow Cooked Pork Knuckle
  5. Better than Takeout Asian Keto Recipes
tuna casserole in black bowl

Join our Keto Community

Don’t forget to link up with Mad Creations on social media so you never miss a recipe.

Instagram | Pinterest | Facebook | 365 |

Keto Meal Plans & Support
Mad Creations Keto Tuna Casserole with Salty Bacon & Cheese

Keto Tuna Casserole with Salty Bacon

A dish that will convert any tuna hater!
4.91 from 11 votes!
Prep Time: 10 mins
Cook Time: 30 mins
Total Time: 40 mins
Course: Dinner
Cuisine: Keto
Diet: Gluten Free
Recipe Category: Low Carb
Calories: 370kcal
Author: Megan Ellam
Servings: 4 serves
Tap or hover over number to scale ingredients
Print Pin Save Rate


  • 15 g butter
  • 15 g olive oil
  • 100 g mushrooms sliced
  • 4 green spring onions chopped
  • 1 tbsp parsley chopped
  • 1/2 tsp xanthan gum (opt. substitutes include psyllium husks, or extra veg, like broccoli, cauliflower)
  • 220 g thickened cream
  • 100 g mozzarella cheese
  • 400 g tinned tuna in springwater
  • salt and pepper to taste
  • 2 bacon rashers diced and cooked in oven until crispy
  • cheese cooked until crispy and crumbled place grated cheese on baking tray and cook in hot oven until melted and golden, remove from oven and leave to cool on tray
  • 200 g zucchini zoodles or cauliflower rice, or konjak noodles



  • Preheat oven to 170℃.
  • Melt butter and oil in saucepan over medium heat. Sauté spring onions and mushrooms until soft.
  • Mix through xanthan gum thicken slightly. Add cream and half of the mozzarella and stir until sauce is thick. Stir through tuna and season to taste.
  • Transfer mornay to casserole dish. Bake 15 minutes.Top with remaining mozzarella and bake a further 5 minutes or until cheese is melted and slightly golden.
  • Sprinkle over crispy bacon and crumbled cheese crisps. Season to taste. Serve with zoodles, and fresh green salad


  • Heat butter and oil 1 minute/80℃/speed 2.
  • Place mushrooms and spring onion into mixing bowl and cook 4 minutes/ Varoma/reverse/soft.
  • Add xanthan, cream and half of mozzarella. Cook 2 minutes/90℃/ reverse/soft.
  • Add tuna, salt and pepper and mix 20 seconds/reverse/speed 2. Follow from Step 4 above.


This dish can be ahead and either kept in the fridge for up to 3 days or frozen in individual serves.

Your Own Notes


Serving: 1serve | Calories: 370kcal | Carbohydrates: 4g | Protein: 8g | Fat: 37g | Saturated Fat: 20g | Cholesterol: 146mg | Sodium: 542mg | Potassium: 504mg | Fiber: 1g | Sugar: 2g | Vitamin A: 1430IU | Vitamin C: 13.4mg | Calcium: 196mg | Iron: 2.3mg | Net Carbs: 3g
Tried this recipe?Mention @meganellam or tag #madcreations!

Share This Recipe

Other Recipes You May Love

Check out our recipe Cookbooks


  • Wendy S says:

    5 stars
    We loved this. Had great flavour. Will be making again

  • Emma S says:

    5 stars
    Best recipe absolutely love it. My dad who hated tuna even eats it.

  • Carol Millington says:

    Tuna Mornay reigning in from the 80’s and 90’s – this is delicious – i didn’t have mushrooms or spring onions so subbed with capsicum and brown onion and sautéed for a bit longer. Winner in our house ever with non Mr. LCHF! Loved the bacon and cheese topping!

  • Melissa F says:

    5 stars
    This is my all time favourite!! Weekly staple!! Plus sooo easy to make!! Highly recommend for everyone to try!! 🙂 <3

  • Tracy M says:

    5 stars
    Unfortunately not a winner with my family – hubby & I liked it but the kids – no way 🙁

  • Lynda says:

    5 stars
    I have made this dish a couple of times now. We love how quick and easy it is. I changed the tuna for white fish ( barramundi) and added some green prawns chopped into pieces. I took the skin off the fish and crisped it up and and added on top of dish when it was out of the oven. Served it with zoodles and salad.
    The second variation was cooking the fish pieces and using the mornay sauce as a topper and served with a green salad. Either way delicious and will be making again. It’s a great recipe .

  • Chris says:

    Yummy will be doing this one

  • Susan says:

    Loved the finished dish.
    Just a couple of queries though. Recipe doesn’t say when to put parsley in, assuming mozzarella is grated and tuna drained.

  • Anna Kara says:

    5 stars
    Made this dish last night whole family loved it. It’s a keeper.

  • Lisa Clarke says:

    5 stars
    Love this recipe. I didn’t have any bacon but it was still delicious. I will definitely make it again.

Leave a Reply

Your email address will not be published.

Recipe Rating

Mad Creations Hub is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to


Get all your keto updates weekly. New recipes EVERY week!