Kalyn's Kitchen

Leftover Corned Beef Low-Carb Reuben Bake (Video)

Leftover Corned Beef Low-Carb Reuben Bake is a delicious way to use leftover corned beef, but you can also buy corned beef at the deli to make this casserole that has all the flavors of reuben sandwiches, without the carbs.

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Leftover Corned Beef Low-Carb Reuben Bake!


Leftover Corned Beef Low-Carb Reuben Bake title photo

I love St. Patrick’s Day, and every year I try to encourage people to cook corned beef and cabbage, which go on sale for this holiday in the U.S. And whether you make my tried-and-true Slow Cooker Corned Beef or Instant Pot Corned Beef with Creamy Horseradish Sauce, I really hope you’ll cook some corned beef for the holiday. And of course I’ve already recommended Roasted Cabbage with Lemon as the perfect side dish for corned beef.

And if you’re lucky enough to have corned beef leftovers, I hope you’ll make this amazing Leftover Corned Beef Low-Carb Reuben Bake. But even if you don’t make corned beef (or don’t get any leftovers!) you can buy corned beef at the deli and make this low-carb casserole with layers of mashed cauliflower, cabbage, corned beef, Swiss cheese, and Thousand Island dressing.  If you’re a fan of the Reuben Sandwich, you’ll recognize some of those ingredients and realize how this casserole got its name.

This is a recipe I came up with several years ago after I saw a Reuben Bake from My Recipes (probably on Pinterest!) I realized I could switch out the potatoes for cheesy cauliflower (and use low-sugar Thousand Island dressing) and make this into a delicious low carb dish. It took me a couple of tries to get the recipe and photos how I wanted them, but when Kara and I tested this final version we gobbled it up. And I’m hoping I don’t sound like I’m completely lacking in modesty if I say this is a complete winner for a way to use leftover corned beef; enjoy!

Leftover Corned Beef Low-Carb Reuben Bake process shots collage

How to Make Leftover Corned Beef Low-Carb Reuben Bake:

(Scroll down for complete printable recipe, including nutritional information.)

  1. Chop up a head of cauliflower and cook in boiling salted water.
  2. Drain cauliflower at least 5 minutes, then use an Immersion Blender (affiliate link) or hand beater to puree the cauliflower with the sour cream.
  3. Stir in grated Swiss cheese and green onions.
  4. Slice up cabbage, shred corned beef apart and then chop, and measure out the Thousand Island dressing. 
  5. Heat olive oil in frying pan and saute the cabbage (seasoned with salt, pepper, and a little caraway seed.)
  6. When cabbage is starting to wilt, add corned beef and cook 1-2 minutes more. 
  7. Let cool for a few minutes and then stir in the Thousand Island Dressing. 
  8. I used a deep casserole dish so you could see the layers, but any glass or crockery casserole dish that’s not too small will work.
  9. Make a layer with half the mashed cauliflower in the bottom of the dish. 
  10. Put the cabbage/corned beef mixture over that and top with grated Swiss Cheese.
  11. Then make another layer of mashed cauliflower, spreading it around.
  12. Top with another layer of grated Swiss Cheese. 
  13. Bake at 375F/190C about 45 minutes, or until it’s bubbling hot and the top is starting to brown. Serve hot. 

Leftover Corned Beef Low-Carb Reuben Bake close-up photo

I promise this will be a hit with anyone who likes corned beef, even if they don’t care about low-carb eating.

More Tasty Low-Carb Ideas with Corned Beef:

Low-Carb and Keto Corned Beef Recipes ~ Kalyn’s Kitchen
Low-Carb Fried Cabbage with Corned Beef ~ Kalyn’s Kitchen
Leftover Corned Beef Soup with Sauerkraut and Tomatoes ~ Kalyn’s Kitchen

Weekend Food Prep:

This recipe has been added to a new category called Weekend Food Prep  to help you find recipes you can prep or cook on the weekend and eat during the week!

Leftover Corned Beef Low-Carb Reuben Bake close-up photo

Leftover Corned Beef Low-Carb Reuben Bake

Yield 8 servings
Prep Time 30 minutes
Cook Time 45 minutes
Total Time 1 hour 15 minutes

If you're lucky enough to end up with some leftover corned beef use it to make this delicious Leftover Corned Beef Low-Carb Reuben Bake!


  • 1 large head cauliflower
  • 1/3 cup sour cream
  • 2 cups grated Swiss cheese (divided)
  • 1/2 cup sliced green onion
  • salt and fresh-ground black pepper to taste
  • 1 medium head green cabbage
  • 2 tsp. olive oil
  • 1/2 tsp. caraway seeds (optional)
  • 2 cups leftover corned beef, shredded and then chopped into bite-sized pieces
  • 1/2 cup Thousand Island Dressing (see notes)


  1. Preheat the oven to 375F/190C.  Fill a pot half fill with water, add a little salt and bring to a boil.
  2. While the water heats, trim away the leaves from the cauliflower, keeping the stems; then coarsely chop cauliflower.  When the water is nearly boiling, add the cauliflower, turn heat to medium, and cook the cauliflower 10-11 minutes or until it’s barely starting to get tender. (Don’t overcook or the mashed cauliflower will be mushy.) Dump cauliflower into a colander placed in the sink and let it drain at least 5 minutes so it’s not wet.
  3. Put cooked cauliflower back into the pan you cooked it in, add the sour cream, and use an Immersion Blender (affiliate link) or Hand Mixer (affiliate link) to puree the cauliflower. (Don’t over blend; I kept it slightly chunky.  Remember it’s going to cook more in the oven.) Mix in 1/2 cup of grated Swiss Cheese and the green onions.
  4. Remove any wilted outer leaves of cabbage, cut the cabbage into quarters, and cut away and discard the core.  Then slice cabbage about 3/8 inch thick.  Shred the corned beef apart into strips and chop to make bite-sized pieces.
  5. Heat the olive oil over medium-high heat in a large non-stick frying pan (I used my favorite Green Pan (affiliate link) to cook the cabbage.)  When the oil is hot, add the cabbage, turn heat to medium, and saute the cabbage, seasoning with salt, pepper, and a little caraway seed if using. Cook about 4 minutes, or until it is starting to slightly brown on some edges.  Add the corned beef and cook 1-2 minutes more.
  6. Turn off heat and let the pan cool down for a minute or two, then stir in the Thousand Island dressing.
  7. Spray a large casserole dish with non-stick spray or olive oil. (The dish I made this in was about 9″ x 12″.)  Put half the mashed cauliflower into the dish and spread into a flat layer. Put the cabbage-corned beef mixture on top of the layer of cauliflower and sprinkle with 3/4 cup grated Swiss cheese. Spread the rest of the mashed cauliflower in a layer on top of that, and sprinkle the cauliflower with another 3/4 cup grated cheese.
  8. Bake uncovered for about 45 minutes, or until the mixture is bubbling hot and the cheese is starting to lightly brown on top.  Serve hot.


I used Litehouse Thousand Island Dressing with 3 carbs per tablespoon for this recipe. Look for the lowest carb dressing you can find.

This recipe adapted by Kalyn and Kara from Reuben Bake on My Recipes.

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 291Total Fat: 20gSaturated Fat: 8gUnsaturated Fat: 10gCholesterol: 61mgSodium: 274mgCarbohydrates: 10gFiber: 3gSugar: 6gProtein: 18g

Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations.

If you make this recipe I'd love to hear how it turns out. Leave a star rating or share on social media with the hashtag #KALYNSKITCHEN, thanks!

Leftover Corned Beef Low-Carb Reuben Bake thumbnail photo

Low-Carb Diet / Low-Glycemic Diet / Low-Carb Diet Suggestions:
For low-carb diets, it’s important to look for Thousand Island Dressing that doesn’t contain a lot of sugar to make Leftover Corned Beef Low-Carb Reuben Bake. (I used Litehouse Thousand Island Dressing with 3 carbs per tablespoon.) Corned beef isn’t really recommended for the South Beach Diet due to the amount of fat, so this is a once-in-a-while treat for South Beach Dieters but I’d certainly make it for St. Patrick’s Day leftovers if you have some. South Beach would also recommend using light sour cream and reduced-fat Swiss cheese if you can find it.

Find More Recipes Like This One:

Use Casserole Recipes to find more recipes like this one. Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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    36 Comments on “Leftover Corned Beef Low-Carb Reuben Bake (Video)”

  1. Forgot to mention that I used a bag of cole slaw that I had instead of having to cut up a cabbage. SO, So much easier.

    • Regarding your earlier comment, you’re right, it looks like there was a mistake when the recipe was switched to the recipe card format. I looked it up in my recipe database and it was supposed to say 1/2 cup grated cheese with the cauliflower and then 3/4 cup on each layer. Thanks for catching that! Of course, I always assume people use as much cheese as they prefer but that is the total of 2 cups listed in the ingredients.

      Good idea to use coleslaw mix if you want to save time.

  2. This came out great, but there’s an error/omission with regard to the amount of cheese in the recipe, so I am also wondering about the nutrition information. The list of ingredients says 2 cups of shredded swiss are needed; however, following the recipe as written would call for a total of 2 1/2 cups of cheese, i.e. 1 cup added to mashed cauliflower + 3/4 on top of corned beef layer + 3/4 on top of last mashed cauliflower layer.

  3. Will try this Amazing recipe tonight & hope I make it. Thanks for such a great recipe.

  4. This was absolutely delicious and so easy to make. One small tip is to use frozen cauliflower instead of the fresh for a real time saver. Just steam it in the bag, drain well and proceed as in the recipe. I cut the recipe in half and a 12 oz bag of cauliflower was the perfect amount. Thanks for the great recipe! I’ll have to remember it for next year’s St. Patrick’s Day leftovers.

  5. (I added sauerkraut to the cabbage mixture.) Layer of mashed spuds, mashed carrots, chopped corned beef/cabbage/kraut topped with Swiss cheese. It’s in the oven. My husband is going to love it! 

  6. Could I use sauerkraut instead of cabbage? 

    • I think that would taste great, but you’d want to make sure it’s VERY well-drained, and probably need to pat dry with paper towels as well as you can so it doesn’t make too much liquid in the finished dish.

  7. Lucky that I have loads of leftover corned beef. Going to make it tonight. Thank you for the lovely recipe.

  8. Thank you for this recipe!! We made it with our leftover St Patrick’s Day dinner and it came out perfect! I made two :: one with our leftover mashed potatoes & carrots for my 3 growing boys and husband and a half portion of the low carb with the cauliflower for me! Everything else we kept the same and it was a big hit with leftovers to take to school for lunch today! Thanks again for this perfect day after St Paddy’s Day meal 🙂

  9. Was really looking forward to this one and it came up short. As I was making it I sampled the sautéed cabbage/corned beef/1000 island mixture and it was really good! I layered it as directed with the cauliflower mash and baked. When we sat down to eat I was disappointed at how mushy the cabbage got. I wonder if it would have been better if I had not sautéed the cabbage and just mixed it with the corned beef raw?

    • Sorry you were disappointed, I didn’t have that problem. Did you cook the cabbage only four minutes like the instructions specify? If so maybe a slightly shorter time or lower heat would give you a better result, but I think if you use raw cabbage it will release a lot of moisture into the finished dish.

  10. I actually have some corned beef in the freezer (and slow cooker has always been my favorite method of cooking it) but I DO NOT like cabbage. Is the cabbage flavor strong? I accept that it is something I should be eating nutritionally and would definitely like ways to incorporate it without gagging

  11. You have caraway seeds in the ingredients but I cant see where you use them in the instructions. Am I missing where its mentioned????

  12. How much corned beef if you have to buy from the deli?

    • I didn't weigh it so I don't know how much 2 cups of corned beef would be in pounds. It doesn't need an exact measurement. You might ask the deli person how much to get.

  13. My family cringes when I make corned beef and cabbage every year but I know this casserole will be a hit. I got two recipes today… this one, and your slow cooker corned beef. Thanks for the inspiration!

  14. Hi Kalyn,
    The next time I'm going to buy a larger corned beef so I can try this recipe.
    I normally don't like casseroles with mashed potatoes so, this one looks great with the cauliflower

  15. This looks like what I need to make tonight with all of my left over corned beef….

  16. Well, I won't have any leftover corned beef but my Irish mama definitely will, and some will definitely be coming my way! Now I know what to do with it – in addition to making hash! 🙂

  17. I love corned beef enough that I think it would get me past the cauliflower resistance! This casserole looks like a total wow to me.