Keto tuna casserole

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This recipe has been reposted here with permission from Diet doctor. The original recipe can be found here.
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.
Print Recipe
Prep Time 15 minutes
Cook Time 20 minutes
Course Main Course


  • 1 oz. butter
  • 1 yellow onion finely chopped
  • 1 green bell pepper finely chopped
  • 1 ½ cups celery stalks finely chopped
  • 1 lb tuna in water drained
  • 3/4 cup mayonnaise
  • 1 cup shredded Parmesan cheese
  • 1 tsp chili flakes
  • salt and pepper


  • 5 ⅔ cups baby spinach


  • 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.
  • Mix tuna, mayonnaise, parmesan cheese, and chili flakes in a greased baking dish. Add fried vegetables and stir.
  • Bake for 15-20 minutes or until golden brown.
  • Serve with baby spinach.


Carbohydrates: 5g
Keyword low-carb
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