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    Home » Recipes » Casserole Recipes

    Published: May 14, 2021 · Last Updated: Sep 22, 2022 by Kyndra Holley

    Keto Tuna Casserole

    This post may contain affiliate links

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    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese
    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese
    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese
    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese

    This Keto Tuna Casserole has all of the classic flavors of a traditional tuna noodle casserole recipe, while being low carb and gluten free. Rich and flavorful cream sauce, with onion, garlic, peas, celery, herbaceous dill, and bright, fresh lemon, paired with shredded cabbage and albacore tuna, then topped with cheese and baked until it is golden brown and bubbly. It's the perfect quick and easy weeknight meal.

    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese
    Table of Contents show
    Ingredients in Keto Tuna Casserole
    Ingredients Notes
    How to Make Keto Tuna Casserole
    Step by Step Instructions
    Recipe Tips and Variations
    Frequently Asked Questions
    More Keto Recipes
    Sign up for our newsletter
    Keto Tuna Casserole

    Ingredients in Keto Tuna Casserole

    Ingredients for cabbage noodle tuna casserole - cabbage, tuna, lemon, garlic, cream, cheese, dill, celery

    Ingredients Notes

    • Cabbage: this is what makes this recipe a keto recipe. By using cabbage in place of traditional noodles, you can cut the carbs and the gluten. I've done this in a few other cabbage noodle recipes, like my Cheesy Smoked Sausage and Cabbage Casserole, Fried Cabbage with Kielbasa, and Egg Roll in a Bowl. I use green cabbage, but any can be used: Savoy cabbage, red cabbage, Napa cabbage, even Brussels sprouts! Cut your favorite cabbage into shreds with a knife or mandolin. You can also use coleslaw mix and make this Keto Tuna Casserole even more simple.
    • Tuna: for the best taste, I highly recommend using sustainably pole caught albacore, canned in water. You can also use fresh tuna or even canned or fresh salmon. For more tuna recipes, check out these Asian Tuna Cakes and Avocado Tuna Salad.
    • Lemon juice and zest: again, fresh is best. The lemon in this recipe really compliments the tuna and adds some bright freshness.
    • Dill: fresh herbs are my favorite way to add flavor to any dish. Dill is the perfect compliment to seafood, and tuna is no exception.
    • Peas: if you really want to cut down on carbs, you can omit the peas from this recipe entirely, but I recommend keeping them! Fresh peas add a beautiful pop of color and sweetness. You can also used canned peas.

    How to Make Keto Tuna Casserole

    Step by step instructions for making homemade low carb tuna casserole

    Step by Step Instructions

    STEP 1: First, heat the olive oil and butter in an extra large ovenproof skillet over medium heat.

    STEP 2: Next, add the cabbage, onion, celery, garlic, sea salt and black pepper to the pan. Sauté vegetables until they are crisp tender - about 10 minutes.

    Step by step instructions for making homemade low carb tuna casserole

    STEP 3: In a separate bowl, mix in the dill, mustard powder, lemon zest, and lemon juice.

    STEP 4: Add the lemon mixture to the pan. Stir to combine.

    Step by step instructions for making homemade low carb tuna casserole

    STEP 5: Pour the heavy cream and 1 cup Parmesan cheese into the pan. Mix in and keep stirring until the cheese has melted and combined with the heavy cream.

    STEP 6: Then, reduce heat to medium low. Simmer, allowing the sauce to thicken.

    Step by step instructions for making homemade low carb tuna casserole

    STEP 7: Once the sauce has started to thicken, stir in the tuna and the peas.

    STEP 8: Sprinkle the remaining Parmesan over the top of the dish and transfer to the oven. Lastly, broil on high for 3 to 5 minutes or until the Parmesan on top has made a golden brown crust.

    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese

    Recipe Tips and Variations

    • Serving suggestions: I recommend serving this Keto Tuna Casserole with some of my favorite vegetable side dishes: Lemon Pepper Green Beans, Brussels Sprouts with Creamy Dijon Cider Dressing, Balsamic Shallot Mushrooms, or even a simple side salad. You can also add mushrooms to the recipe for a boost of extra veggies.
    • Storage: store in the fridge in an airtight container up to 3 days. If you plan to store it in the freezer, you can do so before baking for up to 3 months.
    • Reheating: for best results, reheat this low carb tuna casserole on the stove top or in the microwave. You can add a little cream as well to keep it from drying out, especially if reheating in the microwave.
    • Low carb noodle substitutions: these are plenty of low carb pasta substitutions: zucchini noodles, Shirataki noodles, rainbow vegetable noodles, and even spaghetti squash would work great in this recipe.
    • Protein options: not a fan of tuna? No problem. Try this tuna noodle casserole recipe with fresh chicken, canned chicken, salmon, or shrimp as an alternative protein.
    • Shortcuts: to make this tuna casserole dish even faster, you can use a canned cream of mushroom soup for the sauce and coleslaw mix instead of shredded cabbage. However, using canned soup will increase the carbs quite a bit.
    • Crispy fried onion topping: this adds a great textural contrast. I outline how to make a low carb version of crispy fried onions in this recipe.
    • Cheese it up: add sharp cheddar to really drive up the cheesy goodness of this recipe.
    • Breadcrumb topping: add a layer of crunch without the carbs or the gluten. Try topping this Keto Tuna Casserole with grated parmesan or my nut free breading mix.
    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese

    Frequently Asked Questions

    How do you make tuna casserole from scratch?

    Cook the veggies and aromatics in olive oil and butter until just tender, mix in the seasonings, add heavy cream and Parmesan for a creamy element, and let it all thicken. Finally, add the tuna and peas, sprinkle extra Parmesan on the casserole, and bake until it reaches golden, bubbly perfection.

    How many carbs does tuna casserole have?

    Classic homemade tuna noodle casserole uses pasta as the basis, and a small serving will have at least 22g of carbs. This is a Keto Tuna Casserole, so there are only 7g net carbs per serving.

    What's the best low carb pasta?

    Some great options for low carb pasta are Shirataki noodles, spaghetti squash, zucchini noodles, or even cauliflower.

    white plate with a serving of low carb cabbage noodle tuna casserole

    More Keto Recipes

    • Steamed Artichokes
    • Roasted Cauliflower Steaks with Cheese Sauce
    • Jalapeno Popper Chicken Salad
    • Cucumber Dill Broccoli Slaw
    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese

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    a skillet full of low carb tuna casserole, rich and creamy sauce, baked golden brown with cheese.

    Keto Tuna Casserole


    ★★★★★

    5 from 48 reviews

    • Author: Kyndra Holley
    • Total Time: 45 minutes
    • Yield: Makes 8 Servings 1x
    • Diet: Gluten Free
    Print Recipe
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    Description

    This Keto Tuna Casserole has all of the classic flavors of a traditional tuna noodle casserole recipe, while being low carb and gluten free. Rich and flavorful cream sauce, with onion, garlic, peas, celery, herbaceous dill, and bright, fresh lemon, paired with shredded cabbage and albacore tuna, then topped with cheese and baked until it is golden brown and bubbly. It's the perfect quick and easy weeknight meal. 


    Ingredients

    Units Scale
    • 2 tablespoons olive oil (I use this brand) code kyndraholley for $5 off
    • 2 tablespoons butter
    • medium head green cabbage (about 1 ½ lbs), cut into large shreds
    • 1 cup chopped onion
    • 3 ribs celery, chopped
    • 2 cloves garlic, minced
    • sea salt and black pepper, to taste
    • 2 teaspoons dried dill or 2 tablespoons fresh dill
    • 2 teaspoons dry mustard powder
    • 1 tablespoon lemon zest
    • juice of 1 lemon
    • 1 ½ cups heavy cream
    • 1 ¼ cups grated Parmesan cheese, divided
    • 3 - 5oz cans albacore tuna, drained
    • ½ cup frozen peas

    Instructions

    1. Heat the olive oil and butter in an extra large ovenproof skillet over medium heat.
    2. Once heated, add the cabbage, onion, celery, garlic, sea salt and black pepper to the pan.
    3. Sauté until the vegetables are crisp tender - about 10 minutes.
    4. Mix in the dill, mustard powder, lemon zest, and lemon juice.
    5. Pour the heavy cream and 1 cup Parmesan cheese into the pan. Mix in and keep stirring until the cheese has melted and combined with the heavy cream.
    6. Reduce heat to medium low and let simmer to allow the sauce to thicken.
    7. Once the sauce has started to thicken, stir in the tuna and the peas.
    8. Sprinkle the remaining Parmesan over the top of the dish and transfer to the oven.
    9. Broil on high for 3-5 minutes or until the Parmesan on top has made a golden brown crust.

    Notes

    • net carbs per serving: 7g
    • Storage: store in the fridge in an airtight container up to 3 days. If you plan to store it in the freezer, you can do so before baking for up to 3 months.
    • Reheating: for best results, reheat this low carb tuna casserole on the stove top or in the microwave. You can add a little cream as well to keep it from drying out, especially if reheating in the microwave.
    • Low carb noodle substitutions: these are plenty of low carb pasta substitutions: zucchini noodles, Shirataki noodles, rainbow vegetable noodles, and even spaghetti squash would work great in this recipe.
    • Prep Time: 15 minutes
    • Cook Time: 30 minutes
    • Category: Casserole Recipes
    • Method: Saute
    • Cuisine: American

    Nutrition

    • Serving Size: ⅛th of the recipe
    • Calories: 377
    • Fat: 28g
    • Carbohydrates: 10g
    • Fiber: 3g
    • Protein: 23.5g

    Keywords: keto tuna casserole, low carb tuna casserole recipe, low carb pasta substitutions, homemade tuna noodle casserole, cabbage noodle recipes, gluten free tuna casserole

    Did you make this recipe?

    Tag @kyndraholley on Instagram and hashtag it #peaceloveandlowcarb

    **Recipe originally posted October 24th 2016 - Updated May 14th 2021**

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    Reader Interactions

    Comments

    1. Elizabeth C says

      December 15, 2022 at 8:48 am

      Really wanted a warm, low carb tuna meal instead of cold tuna salad. I didn't have mustard powder but it was still delicious! Warm, satisfying, low carb. Love this!

      ★★★★★

      Reply
    2. Pam says

      December 05, 2022 at 2:49 pm

      This was delicious! I used cabbage and leeks and some smoked Gouda cheese. Love the cream sauce instead of a can. Will definitely make again.

      ★★★★★

      Reply
    3. Kay says

      November 21, 2022 at 4:34 pm

      This tuna casserole is absolutely delicious! My husband and I were feeling tired of the same old low-carb recipes and wanted something different and were craving comfort food. I'll be honest, I was a bit skeptical. But, this is wonderful! I followed the recipe exactly and it turned out perfect! The flavor of the dill/lemon/mustard mixture really brought the flavor to the next level. This is a keeper!

      ★★★★★

      Reply
    4. Debbie says

      November 06, 2022 at 2:42 pm

      This was very good. I loved the lemon, dill, and mustard combination.!

      ★★★★★

      Reply
    5. Anonymous says

      September 03, 2022 at 12:17 pm

      Love this recipe! Used less cream and a little bit more lemon juice.. so refreshing! My husband admitted to enjoying it! Which is a big deal 🙂

      ★★★★★

      Reply
    6. Sarah says

      August 13, 2022 at 8:54 am

      I used egg noodles instead of cabbage as I am keto-ish. I also used low sodium chicken stock bc I had it in the fridge. Excellent recipe, the lemon juice/mustard powder/dill slurry brightens the cream/(pasta in my case)/ and peas. I will consider using the cabbage and am certain is a great keto option.

      ★★★★★

      Reply
    7. Holly says

      August 08, 2022 at 8:20 am

      Delicious.

      ★★★★★

      Reply
    8. Anonymous says

      July 30, 2022 at 8:12 pm

      A lot better than I was expecting!

      ★★★★★

      Reply
    9. Betty says

      May 23, 2022 at 10:10 am

      What can I use so its lower in fat?

      Reply
    10. Lynne Lopes says

      May 19, 2022 at 9:01 pm

      Delicious! I think that next time I make it, I'll sub cooked green beans for the peas (only because of the carbs). I absolutely love peas in it though! I added some paprika & cayenne when cooking the onions. Yum!

      ★★★★

      Reply
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    About Kyndra


    Kyndra
    Hey there! Welcome to my site! I am Kyndra Holley - International Best Selling Cookbook Author, and the face behind this blog. I am an avid lover of all things low carb, keto and gluten free. I focus on real, whole food ingredients that you can find at your local grocer. Read more about Peace Love and Low Carb...

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