Keto tuna casserole

Keto tuna casserole

1
2
3
4
5
4.6
127 Ratings
Not enough ratings
Just like mom used to make—but with a keto upgrade! Ditch the noodles in favor of celery, onions, and peppers, and indulge in a keto meal that's ready in 30 minutes. It's a whole new, delicious thing.
October 2 2017 recipe by , photo by , nutritional review by in Recipes, Dinner, Meal

Keto tuna casserole

1
2
3
4
5
4.6
127 Ratings
Not enough ratings
Just like mom used to make—but with a keto upgrade! Ditch the noodles in favor of celery, onions, and peppers, and indulge in a keto meal that's ready in 30 minutes. It's a whole new, delicious thing.
USMetric
4 servingservings

Ingredients

  • 1 oz. 28 g butter
  • 1 (4 oz.) 1 (110 g) yellow onion, finely choppedyellow onions, finely chopped
  • 1 (5 oz.) 1 (140 g) green bell pepper, finely choppedgreen bell peppers, finely chopped
  • 5½ oz. (1½ cups) 160 g (375 ml) celery stalk, finely choppedcelery stalks, finely chopped
  • 1 lb 450 g tuna in water, drained
  • ¾ cup 180 ml mayonnaise
  • 1 cup (2¾ oz.) 240 ml (80 g) shredded Parmesan cheese
  • 1 tsp 1 tsp chili flakes
  • salt and pepper
Serving
  • 6 oz. (52⁄3 cups) 170 g (1.3 liters) baby spinach
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Instructions

  1. Preheat the oven to 400°F (200°C). Fry onion, bell pepper and celery in butter in a large frying pan until slightly soft. Season with salt and pepper.
  2. Mix tuna, mayonnaise, parmesan cheese, and chili flakes in a greased baking dish. Add fried vegetables and stir.
  3. Bake for 15-20 minutes or until golden brown.
  4. Serve with baby spinach.

Tip!

Canned tuna is a life-saver when fridge and freezer are empty. Try to choose high-quality, MSC-labeled tunafish—preferably in olive oil instead of sunflower oil.

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What did you think? Please share your thoughts in the comment section below!
1 2

79 comments

  1. 51
    Reply to comment #50 by Paulina
    Kristin Parker Team Diet Doctor
    April 18 2019

    Can I freeze

    Yes, you can freeze this dish.

  2. 52
    Venencia
    May 3 2019
    i made this last night and used ingredients as specified. didn't measure the mayo, just eyeballed and the dish came out very nice and not too much oil. used Monterrey jack cheese. perfect dish. my 18 months daughter loved it very much.
  3. 53
    Karyn
    May 29 2019
    I've made this a lot as it is really quick and very tasty. I use tuna in brine as all the options I can find in olive oil are a dodgy sounding "blend". I also add some konjac noodles to bulk it up a bit.
  4. 54
    Venencia
    May 30 2019
    this time i used tuna in brine and feta cheese- delicious and not oily
  5. 55
    Sam
    July 7 2019
    What is best to substitute for the celery? I cant stand celery 🤮
    Replies: #56, #59
  6. 56
    Reply to comment #55 by Sam
    Kristin Parker Team Diet Doctor
    July 9 2019

    What is best to substitute for the celery? I cant stand celery 🤮

    You may wish to omit the celery, there is not a great substitute.

  7. 57
    Deborah Murphy
    July 26 2019
    This was sooooo good! 5 stars 🌟

    I used my cast iron skillet so sautéed the vegetables and then added the rest and popped in oven. One pan clean up made it that much better.

  8. 1 comment removed
  9. 59
    Reply to comment #55 by Sam
    Leigh Batten
    October 23 2019
    I swapped the celery for chopped pickled cucumbers (Mrs Elswoods if you're in the UK) gave a nice crunch and slightly sour against the salty tuna and cheese, delicious!
  10. 60
    Kathleen
    November 30 2019
    I made this and used cream of mushroom and added green beans. At the end I broiled it a bit. Has anyone ate this cold? Or would you suggest always heating it up? I ate some fresh out of the oven and served on spinach. It was lovely and filling, comfort food for sure!!
    Reply: #63
  11. 61
    Bonnie
    December 21 2019
    What are the carbs, protein, calories, and portion size to this dish? Thank you 😊
    Reply: #62
  12. 62
    Reply to comment #61 by Bonnie
    Kristin Parker Team Diet Doctor
    December 22 2019

    What are the carbs, protein, calories, and portion size to this dish? Thank you 😊

    This dish makes four servings as written. All of the nutrition information is in the Nutrition+ tab under the list of ingredients.

    Reply: #85
  13. 63
    Reply to comment #60 by Kathleen
    alexiaday
    December 27 2019
    Wouldn't the cream of mushroom add carbs to it? Or was it homemade?
  14. 64
    Wendy
    January 26 2020
    We absolutely love this dish! The freshly Parmesan makes such a difference. The only addition I make is green olives. Thanks DD
  15. 1 comment removed
  16. 66
    Tori
    February 24 2020
    This time I made it with sour cream, not mayo and also put lemon juice over it before serving and it was really good. I also didn't dress the baby spinach with olive oil and it was a whole new dish!
  17. 67
    Natalie
    March 2 2020
    what is considered one a serving size for this, 1 cup, 1/2 cup? This is not in the nutritional value Thank you
    Reply: #68
  18. 68
    Reply to comment #67 by Natalie
    Kristin Parker Team Diet Doctor
    March 2 2020

    what is considered one a serving size for this, 1 cup, 1/2 cup? This is not in the nutritional value Thank you

    That depends on how much your dish reduces as it cooks. The recipe as written makes 4 servings, so a serving is 1/4 of the finished dish.

  19. 69
    Aniasnina
    April 5 2020
    Loved this dish. Switched it up by adding some frozen spinach instead of peppers. Also only did 1.5oz of butter which worked perfectly since there’s already so much fat from the mayo.

    Would probably even do 3/4 cups of mayo instead of 1 cup the next time.

  20. 2 comments removed
  21. 72
    gailsea73
    June 19 2020
    I loved the result, although I just used tuna in water, not olive oil. It was easy and so yummy and best of all, EASY - the only work was chopping. No doubt I should remain satiated for quite a while given the fat content!
  22. 73
    girlforthegospel
    July 28 2020
    Made this today for the first time and it was sooooo good. Also have the asparagus and walnut salad with it. Very yummy meal.
    Reply: #74
  23. 74
    Reply to comment #73 by girlforthegospel
    Crystal Pullen Team Diet Doctor
    July 28 2020

    Made this today for the first time and it was sooooo good. Also have the asparagus and walnut salad with it. Very yummy meal.

    Wonderful! I am so glad you enjoyed these!

  24. 1 comment removed
  25. 76
    Kerry Merritt Team Diet Doctor
    August 5 2020

    Can I use light mayo instead of regular? How will it affect my keto plan?

    Light mayo is usually lower in fat and higher in sugar/carbs, which is the opposite of what you want to consume. It's super easy to make your own mayo, though. Check out our recipe! https://www.dietdoctor.com/recipes/mayonnaise

  26. 77
    debbie penner
    September 20 2020
    I used mushrooms spinach rather than peppers...I love this dish
  27. 78
    JC
    October 30 2020
    Thank you very much for the recipe. Trying it tonight. I can already taste how amazing it will be.

    This will sound like a silly question, and I can certainly improvise without an answer but...how are you suggesting the spinach specifically be served? Simply on the side, cold without dressing, just tossed in oil? Or is the casserole meant to be served on top of a bed of spinach? Just seems as an inconsequential addition, especially without a little more detail...not to mention a photo that reflects exactly as the recipe seems to suggest. Or just leave out altogether.

    I do like the idea a respondent recommended by baking the spinach inside the casserole. That sounds wonderful.

    Or...picking up on what one of the "if you liked this recipe, you may like these" photos that shows a side of baby spinach leaves with egg and tomato slices that would finish off the recipe completely all the way to the presentation stage.

    Reply: #79
  28. 79
    Reply to comment #78 by JC
    Kristin Parker Team Diet Doctor
    October 30 2020

    This will sound like a silly question, and I can certainly improvise without an answer but...how are you suggesting the spinach specifically be served? Simply on the side, cold without dressing, just tossed in oil? Or is the casserole meant to be served on top of a bed of spinach? Just seems as an inconsequential addition, especially without a little more detail...not to mention a photo that reflects exactly as the recipe seems to suggest. Or just leave out altogether.

    Hi JC, in any of our recipes, if we don't make a specific suggestion like for the spinach in this case, it is because we want to leave it up to you, to serve it however you prefer as it doesn't make a difference for the nutrition information. Some people prefer a little spinach salad on the side while others may prefer the texture of serving the casserole on a bed of spinach.

  29. 1 comment removed
  30. 81
    Judith Fryer
    January 24 2021
    Not a great lover of fish so was all ready to dislike this - pleasantly surprised ! Saying that I did make a few changes. Used tuna in spring water to reduce oiliness - definitely would have put me off. Used half mayo and half sour cream. Halved the celery and added a small gherkin as suggested by someone else. No spinach or olive oil - just a handful of mixed salad leaves/rocket on top.
    Reply: #82
  31. 82
    Reply to comment #81 by Judith Fryer
    Kerry Merritt Team Diet Doctor
    January 24 2021

    Not a great lover of fish so was all ready to dislike this - pleasantly surprised ! Saying that I did make a few changes. Used tuna in spring water to reduce oiliness - definitely would have put me off. Used half mayo and half sour cream. Halved the celery and added a small gherkin as suggested by someone else. No spinach or olive oil - just a handful of mixed salad leaves/rocket on top.

    Sounds great! Thanks for the feedback!

  32. 83
    Carol
    July 19 2021
    How many calories per serving? Yes, I'm counting it all!
    Reply: #84
  33. 84
    Reply to comment #83 by Carol
    Kristin Parker Team Diet Doctor
    July 20 2021

    How many calories per serving? Yes, I'm counting it all!

    You can view the full nutrition information for any of our recipes by clicking the Nutrition+ tab under the list of ingredients.

  34. 85
    Reply to comment #62 by Kristin Parker
    Rachel
    September 8 2021
    Is the nutrition facts really for one serving? 590 calories in 1/4 of the recipe? That seems high but maybe I'm just wrong.
    Reply: #86
  35. 86
    Reply to comment #85 by Rachel
    Kristin Parker Team Diet Doctor
    September 8 2021
    Yes, the nutrition information listed is per serving.
  36. 87
    Susan
    January 16 2022
    I just made this for the first time. I added konjac noodles as per another comment. I also added lemon juice and wholegrain mustard instead of chilli flakes, and broccoli instead of green pepper. Yum.
    Sue Acres
  37. 88
    Jen W
    October 4 2022
    Excellent. As others recommended, I chopped up just a few gherkins, used sour cream instead of mayo because that's what I happened to have, and threw in a few chopped sundried tomatoes in oil that needed using. Will definitely be making it again.
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Ratings

5
76%
4
17%
3
3%
2
2%
1
2%
4.6
1
2
3
4
5
127 Ratings

Ratings

5
76%
4
17%
3
3%
2
2%
1
2%
4.6
1
2
3
4
5
127 Ratings