Keto Reuben Casserole Recipe

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Craving a Reuben? Stay on track with this delicious Keto Reuben Casserole Recipe! A perfect choice for making a leftover corned beef casserole that satisfies your cravings while staying in your macros, this recipe is deliciously simple.

keto reuben casserole recipe on a plate with fork.

Keto Reuben Casserole Recipe

Toasted bread, a layer of thousand island dressing, slices of corned beef, and classic sauerkraut are the makings of a deli sandwich everyone recognizes. The problem with this on a keto diet, all comes down to that bread. That's where this keto reuben casserole recipe saves the day!

One of the best creations of recent years has come in the Reuben casserole. This delicious meal uses leftover corned beef, cabbage, the same dressing, and usually a noodle or potato addition. To create a keto-friendly version, I use cauliflower for a creamy and perfect compliment to the saltiness of the corned beef. There's much to love about this dish, and it will surely satisfy your Reuben cravings with none of the worrisome carbs.

plated serving of corned beef casserole in a collage for pinterest.

Is Sauerkraut a Low Carb Food?

Yes! Sauerkraut is a wonderful addition to any keto or low carb journey. While this recipe uses fresh cabbage rather than sauerkraut, you can easily add it instead

If you want to use a jar or can of sauerkraut in your keto Reuben casserole instead of fresh cabbage, just substitute 2 cups cooked sauerkraut for the small head of cabbage.

ingredients needed for reuben casserole on the counter all laid out.

Is Thousand Island Keto Friendly?

Most regular bottles of Thousand Island dressing contain some sugar or a ketchup base that has added sugar. To find a keto-friendly version, check the bottle's ingredients and avoid any with sweeteners.

Alternatively, you can make a homemade Thousand Island dressing we have listed in the printable recipe card below.

How do I Make Keto Thousand Island?

For my homemade dressing to go in your corned beef casserole, you will simply mix the ingredients together in a mason jar and shake well until fully blended.

Ingredients for Thousand Island include mayonnaise, sugar-free ketchup, dill pickle relish, salt, vinegar, and sugar substitute. For full measurements, see the printable recipe below.

spatula serving keto dinner.

How to Make a Keto Reuben Casserole

Start by preparing your baking dish and preheating the oven.

If you do not have a keto-friendly dressing on hand, follow the recipe for making a homemade Thousand Island and set it aside.

Now, you will bring water to a boil, add in salt and your cauliflower and cook for 10 minutes or until tender. You can also use an already riced or cooked cauliflower if preferred.

Drain the cauliflower, then add in butter, sour cream, and blend as you would mash potatoes and add in cheese. This mixture may be lumpy, but that is okay.

Now, mix together your chopped cabbage, corned beef, and the dressing together, and pour it into the prepared baking dish.

Spread the mashed cauliflower mixture over the top, and sprinkle the remaining cheese over this mixture.

Bake until heated through and bubbling then serve with sliced green onions.

casserole dish with corned beef and cabbage.

Want More Casseroles?

Keto meals are so much easier to manage when you have a great flavorful arsenal of casseroles in your meal plan. Below are a few more of my favorites to keep you making delicious meals to serve up to your family.

  • Making this Unstuffed Cabbage Roll Casserole is one of the easiest and tastiest meals you can have on your menu. Loaded with veggies and a perfect keto-friendly meal.
  • My Keto Ground Beef Casserole is a go-to meal that is not just delicious, but family-friendly. Everyone will beg you to make this more often!
  • Throw everything into this Kitchen Sink Casserole with bacon being a key ingredient. It's always a hit at our dinner table.
  • Don't skip Taco Tuesday when you make this amazing Chicken Fajita Casserole. Loaded with flavor and easy to make, it stays in rotation on my menu.
spatula serving corned beef reuben casserole.
keto reuben casserole

Keto Reuben Casserole Recipe

Yield: 12
Prep Time: 15 minutes
Cook Time: 3 minutes
Total Time: 18 minutes

Make this Keto Reuben Casserole Recipe as a great way to use up leftover corned beef and cabbage. A flavor-packed meal everyone will clamor to enjoy!


  • 2 cups leftover corned beef, coarsely chopped
  • 1 head cauliflower, cut into florets
  • 1 teaspoon salt
  • 1 tablespoon butter
  • ⅓ cup sour cream
  • 3 cups leftover cabbage OR 1 small head cabbage (to cook and drain)
  • 1 (8 ounce) block swiss cheese, shredded and divided
  • ½ cup Thousand Island dressing, low carb or homemade
  • Sliced green onion, for garnish
  • For Thousand Island dressing:
  • 1 cup mayonnaise
  • 3 tablespoons no sugar added ketchup
  • 3 tablespoons dill pickle relish
  • 1 tablespoon white distilled vinegar
  • ½ teaspoon salt
  • ¼ teaspoon monkfruit sweetener


  1. Preheat oven to 350 degrees. Prepare a 9x13 baking dish with nonstick cooking spray.
  2. Prepare Thousand Island dressing by placing all ingredients in a mason jar, seal, and shake to combine.
  3. Bring a stockpot of water to a boil. Add the salt and cauliflower. Cook the cauliflower for about 10 minutes or until tender. Drain well in a colander.
  4. Return the cauliflower to the stockpot and add the butter and sour cream. Beat using a hand mixer until the mixture combines. It may be lumpy. Stir in one cup of shredded cheese.
  5. In a large bowl, mix together the cooked cabbage, corned beef, and dressing. Transfer to baking dish.
  6. Spread mashed cauliflower over corned beef and cabbage layer. Top with remaining cheese.
  7. Bake for 30 to 45 minutes or until heated through and bubbling.
  8. Top with sliced green onions and serve.

Nutrition Information:
Yield: 12 Serving Size: 1
Amount Per Serving: Calories: 348Total Fat: 30gTrans Fat: 0gCarbohydrates: 8gNet Carbohydrates: 6gFiber: 2gProtein: 11g

Nutrition facts are auto- populated by the app for this recipe card, numbers may vary. For best results, input your exact brand ingredients into a recipe analyzer like Verywell or MyFitnessPal.

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2 thoughts on “Keto Reuben Casserole Recipe”

  1. We made this after St Pattys day this year and I was surprised at how good it was , no offense, I just don't like cauliflower. I would eat it again

    • Good to hear! It is great any time of the year, try using deli corned beef in the off season.


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