Cheesy Keto Fish Casserole Low Carb Recipe | KetoVale
keto fish casserole

Cheesy Keto Fish Casserole Low Carb Recipe

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If you have some leftover fish from yesterday, this Keto Fish Casserole recipe will show you an alternative way on how to use it to make a new delicious dish.

We will all agree that fish and seafood, in general, is good for our health. They contain sources of proteins, fatty acids, vitamin D, iodine, selenium, and taurine. All of them are important to our health. It is nothing wrong by including fish in your ketogenic diet. 

One portion of this leftover fish casserole contains a good amount of fats and protein, combined together they can keep you full for a couple of hours.

To make this casserole even more appealing, there are some broccoli florets and delicious sauce I included in. 

keto leftover fish casserole

You just need to spend 10 minutes in the kitchen to prepare it all together and wait 20 more minutes for it to be baked golden brown and delicious.

How to Make Low Carb Fish Casserole

Preheat your oven to 350 F degrees. 

In a saucepan over medium heat add in all of the sauce ingredients and let it cook for 3 minutes with constant stirring. 

sauce ingredients in a saucepan

In a pot aside, boil some water and steam the broccoli florets for about 3 minutes. 

Meanwhile, using forks (or your hands) to shred the fish into small pieces.

shred the fish

In a casserole pan, add in broccoli florets and top them with shredded fish, pour the sauce on top and sprinkle with shredded cheese. 

top casserole pan with ingredients

Bake in preheated oven for about 20 minutes. Let it sit for 5 minutes, sprinkle with chopped green onion and enjoy.

low carb leftover fish casserole


keto fish casserole
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Keto Fish Casserole

This is one perfect brand new and delicious keto-friendly fish casserole recipe using leftover fish.
Course Dinner
Cuisine Ketogenic, Low Carb
Keyword fish casserole, leftover fish casserole
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 3
Calories 474kcal
Author Tanya K.


  • 10 oz broccoli florets
  • 10 oz cooked fish leftover baked fish
  • 3 oz Gouda cheese shredded
  • 1 tsp green onion chopped
  • 4 cups water to steam broccoli

For Sauce

  • 1/2 cup heavy cream
  • 2 tbsp Grana Padano grated
  • 1 tbsp butter
  • 2 oz cream cheese
  • 1/4 tsp garlic flakes
  • 1/8 tsp chili flakes
  • sea salt and black pepper to taste


  • Preheat the oven to 350F.
  • Prepare the sauce: add all sauce ingredients to a saucepan and simmer on medium heat for 3 minutes stirring occasionally.
  • In a pan bring water to a boil and steam broccoli florets for 3 minutes or until tender and vibrant green.
  • Shred the fish with 2 forks.
  • Transfer broccoli to the casserole dish, top with shredded fish, pour the sauce on top and sprinkle with shredded cheese.
  • Bake for 20 minutes or until golden.
  • Let sit 5 minutes, sprinkle with chopped green onion and enjoy!



*You can use any type of fish, even fresh fish, but you need to cook it first by frying or baking it with salt and pepper.


Nutrition Facts
Keto Fish Casserole
Amount Per Serving
Calories 474 Calories from Fat 324
% Daily Value*
Fat 36g55%
Saturated Fat 21g105%
Cholesterol 167mg56%
Sodium 494mg21%
Potassium 674mg19%
Carbohydrates 9g3%
Fiber 2g8%
Sugar 3g3%
Protein 32g64%
Vitamin A 1755IU35%
Vitamin C 84.3mg102%
Calcium 346mg35%
Iron 1.4mg8%
* Percent Daily Values are based on a 2000 calorie diet.
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