Easy Keto Reuben Casserole

Reuben sandwiches always hit that perfect combo: salty corned beef, tangy sauerkraut, melted Swiss, and creamy Thousand Island. But the bread—while delicious—is off the table when you’re eating low-carb. That’s how this keto Reuben casserole came to life. All the bold flavors are layered into a hearty, cheesy bake that satisfies every craving without a single slice of rye. It’s warm, filling, and surprisingly simple to assemble.

This dish is especially handy when feeding a crowd or using up leftover corned beef. It’s weeknight-friendly and makes outstanding leftovers. Even people who swear they don’t like sauerkraut end up scraping their plates—something magical happens when it’s mixed with creamy dressing and melted cheese.

Ingredients

Main Ingredients

• 3 cups cooked corned beef, sliced or shredded
• 2 cups sauerkraut, drained and squeezed dry
• 1 ½ cups shredded Swiss cheese, divided
• 1/2 cup cream cheese, softened
• 1/2 cup mayonnaise
• 1/4 cup sugar-free ketchup
• 2 teaspoons dill pickle relish (no sugar added)
• 1 teaspoon Dijon mustard
• 1/2 teaspoon onion powder
• 1/4 teaspoon black pepper
• 1 tablespoon butter (for sautéing, optional)

Optional Add-Ins

• 1/2 cup sautéed onions
• 1/4 teaspoon smoked paprika
• Extra corned beef crisped in a pan for topping

Ingredient Substitutions

• Swiss cheese → provolone, Monterey Jack, or mozzarella
• Corned beef → pastrami or deli roast beef
• Sauerkraut → finely shredded cabbage sautéed in butter
• Mayo → Greek yogurt (lower fat, tangier flavor)

Instructions

1. Prep the Sauerkraut

Sauerkraut can hold a surprising amount of liquid. Drain it well and squeeze out excess moisture in a towel or paper towel. This step prevents your casserole from becoming watery.

2. Make the Dressing

In a bowl, combine cream cheese, mayonnaise, sugar-free ketchup, dill pickle relish, Dijon mustard, onion powder, and black pepper. Stir until smooth. This creates a keto-friendly Thousand Island–style mixture.

3. Cook the Sauerkraut (Optional)

If you want a deeper flavor, melt butter in a skillet and sauté the sauerkraut for 3–5 minutes. It softens and gets sweeter, which helps balance salty meat.

4. Layer the Casserole

Grease a 9×13 baking dish. Spread the corned beef evenly across the bottom. Toss the sauerkraut gently with half the dressing, then layer it on top of the beef. Sprinkle 1 cup of Swiss cheese over everything.

5. Bake

Bake at 375°F (190°C) for 20–25 minutes until the cheese melts and edges get lightly golden.

6. Top and Serve

Remove from the oven and drizzle the remaining dressing over the top. Add the rest of the Swiss cheese and return to the oven for 5 minutes to melt.

Preparation & Cooking Time

• Prep Time: 15 minutes
• Cook Time: 25–30 minutes
• Total Time: 40–45 minutes
• Serves: 6–8

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Helpful Notes

• Dry sauerkraut is the key to structure and flavor. Moisture dilutes the sauce and dulls the casserole.
• If you prefer thick chunks of meat, cut corned beef into cubes instead of shredding—it gives the dish more chew.
• A quick broil at the end adds beautiful browning, just keep an eye on the cheese.
• Let the casserole rest 8–10 minutes before serving. The layers settle and slice cleanly.

Flavor Variations

• Ranch Reuben
  Swap the dressing sauce for creamy ranch and use provolone cheese.
• Pastrami Heat
  Use pastrami instead of corned beef and sprinkle in crushed red pepper.
• Cabbage Lovers
  Mix sauerkraut and sautéed cabbage for a milder, sweeter contrast.
• Pickle Boost
  Add diced dill pickles or pickle juice for stronger acidity.

Serving Suggestions

This casserole is rich, so balance it with lighter sides:

• Fresh arugula or spinach salad with lemon vinaigrette
• Roasted asparagus or green beans
• Sliced tomatoes with olive oil and pepper

A dollop of mustard or extra dill relish on top can pull the whole dish together. If you’re serving a crowd, add a side of keto bread or chaffles for a Reuben “sandwich” experience.

Storage & Reheating

• Refrigerate in sealed containers for up to 4 days.
• Freeze portions tightly wrapped for up to 2 months.
• Reheat in the oven at 325°F (165°C) until warmed through. Microwaving works but may soften the top cheese.

FAQs

Can I prepare this casserole ahead of time?

Yes. Assemble the layers and refrigerate unbaked for up to 24 hours. Bake just before serving.

Do I need to rinse the sauerkraut?

Only if it’s extremely salty. Most store-bought sauerkraut works fine once drained and squeezed dry.

Can I use deli-sliced corned beef?

Absolutely. Stack multiple slices and cut into strips or cubes. It melts beautifully into the casserole.

How can I make this lighter in calories?

Replace mayonnaise with Greek yogurt or half mayo/half yogurt. Use reduced-fat Swiss cheese or part-skim mozzarella.

Is this recipe strictly keto?

Yes, if you use sugar-free ketchup and low-carb relishes. Check labels—many condiments hide sugar.

Final Thoughts

This keto Reuben casserole captures everything great about the classic sandwich without the bread holding you back. It’s rich, savory, and layered with the kind of tangy, cheesy comfort that never gets old. Serve it as a weeknight meal, prep it for lunches, or bring it to a potluck and watch it disappear. The flavors only deepen as it rests, making leftovers a bonus rather than an afterthought.