Keto Reuben Casserole: The Ultimate Low-Carb Comfort Dish

This casserole uses simple ingredients to recreate the savory, tangy, and creamy flavors of a Reuben sandwich. Drain the sauerkraut thoroughly and choose low-sugar condiments to help keep the carbohydrate count down.

Ingredients List

• 1 pound deli corned beef, chopped: Provides the savory, salty base of the casserole.
• 1 cup sauerkraut, drained well: Adds the tangy flavor that makes a Reuben distinctive.
• 2 cups shredded Swiss cheese: Melts over the filling and adds a mild, nutty flavor.
• 1/2 cup full-fat mayonnaise: Creates a rich, creamy dressing.
• 4 tablespoons sugar-free ketchup: Adds sweetness and tomato flavor without the added sugar found in many regular ketchup brands.
• 2 tablespoons finely minced white onion: Adds a little sharpness and depth.
• 2 teaspoons granulated sugar-free sweetener: Balances the acidity of the sauerkraut and vinegar.
• 2 teaspoons dill pickle relish: Adds a pickle-like tang to the dressing.
• 2 teaspoons white vinegar: Brightens the dressing and balances the richness.

Step 1: Preheat the Oven

Preheat your oven to 400°F (200°C). Lightly grease a 9 × 13-inch baking dish with cooking spray or a thin layer of oil.

Step 2: Prepare the Reuben Dressing

In a medium bowl, combine the mayonnaise, sugar-free ketchup, minced onion, granulated sweetener, dill pickle relish, and white vinegar.

Stir until the dressing is smooth and evenly mixed. Taste a small amount and adjust the vinegar or sweetener if desired.

Step 3: Add the Corned Beef

Spread the chopped corned beef evenly across the bottom of the prepared baking dish. Separate any large clumps so the meat is distributed throughout the casserole.

Step 4: Layer the Sauerkraut

Drain the sauerkraut thoroughly, pressing out excess liquid with a spoon or clean kitchen towel. Spread it evenly over the corned beef.

This step is important because excess liquid can collect at the bottom of the dish during baking.

Step 5: Spread the Dressing

Spoon the prepared Reuben dressing over the sauerkraut. Use the back of a spoon or a spatula to spread it evenly, covering most of the surface.

Step 6: Add the Swiss Cheese

Sprinkle the shredded Swiss cheese evenly over the dressing. Make sure the edges are covered so the cheese melts into a delicious topping.

Step 7: Bake Until Bubbly

Place the casserole in the preheated oven and bake for approximately 20 minutes, or until the cheese is fully melted, bubbling, and lightly golden in places.

If the cheese begins browning too quickly before the casserole is hot throughout, loosely cover the dish with foil for the remaining baking time.

Step 8: Rest and Serve

Remove the casserole from the oven and let it rest for about 5 minutes before serving. This gives the layers time to settle and makes the portions easier to scoop.

Serve warm while the Swiss cheese is melted and the dressing is creamy.

• Drain the sauerkraut well: Excess liquid is the biggest cause of watery casserole. Press out as much moisture as possible before layering.
• Use freshly shredded cheese: It usually melts more smoothly than pre-shredded cheese coated with anti-caking agents.
• Chop the corned beef evenly: Smaller pieces distribute better and make the casserole easier to serve.
• Balance the dressing: Taste it before assembling. Add a little more vinegar for tang or a small amount of sweetener to soften the acidity.
• Watch the cheese: The casserole only needs enough time for the ingredients to heat through and the cheese to melt and brown lightly.
• Let it rest before serving: A short rest helps reduce loose liquid and makes serving neater.
• Check the condiments: Sugar-free ketchup and relish can vary in carbohydrate content, so review the labels if you are following a strict keto plan.

Skipping the sauerkraut draining step: Excess moisture can leave liquid at the bottom of the baking dish.

Using too much dressing: The specified amount should coat the layers without drowning them. Spread it evenly rather than adding extra without adjusting the other ingredients.

Overpowering the dressing with onion: Mince the onion finely and measure it carefully for a balanced flavor.

Overbaking the casserole: Too much oven time can dry out the meat and make the cheese greasy. Remove it when hot and bubbly.

Assuming all sugar-free products are carb-free: Always check the nutrition label for the ketchup, relish, and sweetener you use.

• Extra-cheesy Reuben casserole: Use a blend of Swiss and mozzarella for a stretchier cheese topping.
• Spicy version: Add a pinch of red pepper flakes or a little sugar-free hot sauce to the dressing.
• Mushroom addition: Add a layer of sautéed mushrooms beneath the sauerkraut. Cook off excess moisture before assembling.
• Broccoli variation: Add a small layer of cooked, well-drained broccoli for extra texture. This changes the traditional Reuben flavor but makes the dish more vegetable-forward.
• Leftover corned beef version: Use leftover cooked corned beef from a previous meal. Chop it finely and remove any excess surface moisture before layering.
• Stronger pickle flavor: Add a little extra dill pickle relish or a few finely chopped dill pickle pieces, accounting for any additional carbohydrates.

Keto Reuben casserole is rich, cheesy, and tangy, so simple sides work best.

• Green salad: Serve with mixed greens, cucumber, and a light vinaigrette.
• Roasted broccoli: Adds color and texture alongside the creamy casserole.
• Sautéed green beans: A simple vegetable side that balances the rich dressing.
• Low-carb dill pickles: Reinforce the classic Reuben flavor.
• Cauliflower mash: A warm, low-carb side for soaking up the savory juices.
• Olives: Serve a small bowl on the side for a salty, tangy addition.

Is Keto Reuben Casserole low-carb?

Yes, it can be a low-carb meal when made with suitable ingredients. Corned beef, cheese, and mayonnaise are naturally low in carbohydrates, while sauerkraut and condiments contribute some carbs. Choose sugar-free ketchup and relish, and check the labels to calculate your portion accurately.

Can I make Keto Reuben Casserole ahead of time?

Yes. Assemble the casserole, cover it, and refrigerate it for up to 24 hours before baking. You may need to add a few minutes to the baking time if the dish is cold from the refrigerator. Make sure the center is hot before serving.

How do I prevent a watery Reuben casserole?

Drain and squeeze the sauerkraut thoroughly before adding it to the dish. Avoid adding extra dressing, and let the casserole rest for about 5 minutes after baking so the layers settle.

Can I use leftover corned beef?

Absolutely. Leftover cooked corned beef is an excellent choice. Chop it into small pieces and use it in place of deli corned beef. If it is particularly salty, consider reducing the salt elsewhere in the meal.

What cheese is best for Reuben casserole?

Swiss cheese provides the traditional Reuben flavor. You can combine it with mozzarella for a stretchier topping or use a little Monterey Jack for a milder result.

Can I freeze Keto Reuben Casserole?

Yes. Cool the casserole, portion it into freezer-safe containers, and freeze for up to about one month for best quality. Thaw it overnight in the refrigerator and reheat until hot throughout. The dressing may separate slightly after freezing, but the casserole should still be enjoyable.

What can I serve with Keto Reuben Casserole?

A green salad, roasted broccoli, sautéed green beans, cauliflower mash, olives, or low-carb dill pickles all pair well with the casserole.