Creamy Potato Soup with Corned Beef and Cabbage | Easy Leftovers

The Best Way to Use Up St. Patrick’s Day Leftovers

If your fridge is full of leftover corned beef and cabbage after St. Patrick’s Day, this creamy potato and Swiss cheese soup is exactly what you need. It’s rich, cozy, and packed with tender chunks of corned beef, buttery potatoes, melty Swiss cheese, and soft cabbage in a velvety broth. Think Reuben meets comfort soup — hearty, satisfying, and incredibly easy.

This leftover corned beef soup is perfect for chilly March nights, quick weeknight dinners, or even meal prep for the week ahead.

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Why You’ll Love This Soup

Ingredients

• 3 tablespoons butter
• 1 small onion, diced
• 3 cloves garlic, minced
• 4 cups Yukon gold potatoes, peeled and diced
• 2 cups chopped leftover corned beef
• 2 cups chopped cooked cabbage
• 4 cups chicken broth
• 1 cup heavy cream
• 2 cups freshly shredded Swiss cheese
• 1 tablespoon Dijon mustard
• ½ teaspoon black pepper
• Salt to taste
• Fresh parsley for garnish

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How to Make Creamy Corned Beef & Cabbage Soup

1. Sauté the Aromatics

In a large Dutch oven or heavy pot, melt butter over medium heat. Add diced onion and cook until soft and translucent, about 5 minutes. Stir in garlic and cook another 30 seconds.

2. Cook the Potatoes

Add diced potatoes and chicken broth. Bring to a gentle boil, then reduce to simmer. Cook for 12–15 minutes until potatoes are fork-tender.

3. Add the Leftovers

Stir in chopped corned beef and cabbage, carrots, and potatoes you have leftover from your boiled dinner. Simmer for 5 minutes to warm through.

4. Make It Creamy

Reduce heat to low. Stir in heavy cream and Dijon mustard.

Gradually add shredded Swiss cheese, stirring constantly until melted and smooth. Do not boil once cheese is added — this keeps the soup silky.

5. Season & Serve

Taste and adjust salt and pepper. Ladle into bowls and garnish with parsley or extra Swiss cheese.

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Tips for the Best Leftover Corned Beef Soup

• Shred your own Swiss cheese for smoother melting.
• Use Yukon Gold potatoes for a naturally creamy texture.
• Want it thicker? Mash a few potatoes directly in the pot.
• Add a splash of apple cider vinegar for brightness.
• For extra flavor, stir in a spoonful of sauerkraut.

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Variations

• Add carrots or celery for extra vegetables
• Swap Swiss for Gruyère
• Make it spicy with cracked red pepper
• Blend half the soup for a thicker chowder-style version

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Storage

Store in an airtight container in the refrigerator for up to 4 days. Reheat gently over low heat, stirring often. Add a splash of broth or cream if needed.

This soup also freezes well without the cheese added — stir cheese in after reheating.

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FAQ

Can I use leftover raw cabbage?
Yes. Just sauté it with the onions until softened before adding broth.

What if I don’t have Swiss cheese?
Gruyère, white cheddar, or even provolone will work.

Can I make this in a slow cooker?
Yes. Add everything except cream and cheese. Cook on low 6–7 hours. Stir in cream and cheese at the end.

Don’t let those St. Patrick’s Day leftovers go to waste. This creamy corned beef and cabbage soup transforms simple ingredients into a rich, cozy meal your family will request every year. It’s comforting, nostalgic, and packed with bold Irish-inspired flavor — the perfect way to celebrate long after the holiday ends.