Name: Low Carb Tuna Casserole (Keto Seafood Casserole)
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Yield: 6
Cuisine: American
Ingredients: 3 cups roasted cauliflower (recipe HERE), florets about 1" in size. (See notes below); 2 cans (6 1/2 oz) tuna, salmon, crab, or shrimp; 1/2 cup chopped celery; 1/2 cup sliced green onions; 1/2 cup mayonnaise; 1/2 cup sour cream; 2 teaspoons of dijon mustard; 1 tablespoon of your favorite fresh herb, chopped. Or, 1 teaspoon dried (dill, thyme, basil, chives); 1/2 teaspoon of salt (I used Himalayan pink salt, but any salt is fine); 1/4 teaspoon of pepper; 1 small zucchini, very thinly sliced; 1 cup shredded jack cheese (mozzarella, swiss, or cheddar will work fine too); 1/4 cup pork rind panko

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Low Carb Tuna Casserole (Keto Seafood Casserole), is made delicious with cauliflower and zucchini, a creamy herb sauce, tuna, and layered with cheese. Sure to become a new family favorite, this low carb seafood casserole is so easy to make it so it’s perfect for a busy weeknight meal. Make this healthy tuna veggie casserole today!

The Perfect Low Carb and Keto Seafood Casserole

A tasty low carb easy cheesy tuna casserole that is delicious! My husband and boys all love this recipe! It is family-friendly, and with the vegetables is really a healthy one-dish meal.

Why You Will Love This Tuna “Noodle” Casserole

A Cheap Keto Tuna Recipe

I’m always looking for low carb recipes using tuna because it’s such a cheap meal! Also, because it is a pantry item it has a long shelf life and doesn’t take up precious space in your fridge or freezer.

Family Friendly

This low carb tuna “noodle” cauliflower casserole is another recipe that works for everyone in my house. Because I am the only one on a ketogenic diet in my house it’s much simpler to make only one dish – rather than making their meal and then something separate for me. I find I start cheating on my diet if I have to make multiple meals.

A Healthy Tuna Veggie Casserole

It’s a great way to sneak in extra veggies! This tuna casserole with cauliflower also has zucchini – perfect, right? Baked zucchini always adds such wonderful flavor to a dish. Between the cauliflower and zucchini, you have a full serving of vegetables in this recipe!

I love to serve this with diced tomato and avocado for even more veggies. It gives it a nice fresh taste.

A Healthy Tuna Casserole – Without Soup

I also love that this is a healthy tuna casserole without soup. I do use canned soups from time to time for convenience, but also because they taste good, and add a lot of flavor. Some of you may want less processed ingredients, however, and may not want a canned cream soup.

You can substitute a condensed cream soup in this recipe if you want too, however! I remember my aunt using condensed cream of shrimp soup in a shrimp casserole she used to make.

While I haven’t made her exact combination of canned shrimp and cream of shrimp soup in this recipe, I am positive it will turn out good. Make sure to adjust your added salt down. Some cream soups can be salty. Do a taste test!

Remember that if you do substitute a cream of “anything” soup, it can add carbs so just be aware and adjust your daily intake accordingly. Also, the mayonnaise used in this recipe has a much higher fat content than a condensed cream soup. Take this into consideration if you are following a keto diet.

Not all canned seafood is created equal. Here is a great post from paleoleap.com, Buying Canned Fish, What to Know, What to Buy, What to Avoid

It’s Low Carb and Keto Friendly

With 20.9 grams of fat, and 8.5g net carbs and 22g protein, it fits nicely in with a low carb and ketogenic diet. Yay!

Want more low carb and easy keto dinner recipes? Check out my post Fast and Easy Keto Dinner Ideas, (HERE)

Can I Substitute Other Seafood In This Low Carb Tuna Casserole?

Yes! You can substitute canned crab, salmon, and shrimp in this recipe.

You can also use fresh seafood as well, but you have to be careful as some fish and shellfish can produce a lot of liquid and could make the recipe a little bit runnier.

Ingredients You’ll Need to Make Low Carb Seafood Casserole

This low carb recipe using tuna uses mostly ingredients you probably already have on hand. I created this recipe from cauliflower, zucchini, and green onion that I had in my fridge one day! It just ended up being the perfect combination!

Here are the ingredients that you will need:

3 cups cauliflower, florets about 1″ in size roasted, steamed or boiled until just tender (see notes below)
2 cans (6 1/2 oz) tuna, salmon, crab, or shrimp
1/2 cup chopped celery
1/2 cup sliced green onions
1/2 cup mayonnaise
1/2 cup sour cream
2 teaspoons of dijon mustard
1 tablespoon of your favorite fresh herb or 1 teaspoon dried (dill, thyme, basil, chives)
1/2 teaspoon of salt (I used Himalayan pink salt (my favorite is HERE), but any salt is fine!)
1/4 teaspoon of pepper
1 small zucchini, very thinly sliced
1 cup shredded jack cheese (mozzarella, swiss, or cheddar will work fine too)
1/4 cup pork rind panko, (HERE)

How Do You Make Keto Tuna Zucchini Casserole?

Okay, this is so easy and good you will wonder why you have never made this before! 🙂 Here are the steps to make this super delicious keto seafood casserole:

Prep And Assemble Your Ingredients

Preheat your oven to 350 degrees

Drain your tuna (or salmon, shrimp, or crab), and set aside. Chop your vegetables and assemble all other ingredients.

Cook Your Cauliflower

See recipe, (HERE) on how to steam, broil, or roast your cauliflower

Combine All Ingredients Into A Bowl

Drain tuna (or other seafood), and set aside.

In a bowl, combine cauliflower, tuna, celery, green onions, mayonnaise, sour cream, mustard, herbs, salt, and pepper.

Layer Mixture Into Baking Dish

In a buttered 1-1/2 quart baking dish, spoon half of the mixture and spread evenly. Top with half the zucchini and half the cheese.

Top with remaining half of mixture, zucchini, and finish with cheese. Sprinkle top with pork rind panko.

Bake Until Bubbly

Bake for 40 minutes or until the dish is hot and cheese is bubbly.

Eat and Enjoy!

Let casserole sit for about 5-10 minutes before serving. When you’re ready to serve, sprinkle with fresh herbs. I love to top it with diced tomato, and sometimes avocado too. Sneak in extra veggies! Enjoy!

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