Name: Easy Flank Steak and Mushroom Soup with Sour Cream and Cabbage Noodles
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: Comfort Food
Ingredients: 450g flank steak; 1 tablespoon olive oil; 1 medium onion, chopped; 3 cloves garlic, minced; 250g mushrooms, sliced; 4 cups beef broth; 3/4 cup sour cream; 3 cups green cabbage, thinly sliced; 1 teaspoon salt; 1/2 teaspoon black pepper; 1/2 teaspoon paprika; 1 bay leaf; 1 tablespoon fresh dill (optional)

When cooler weather rolls in or you just want something that feels like a hug in a bowl, this easy flank steak and mushroom soup is the answer. It’s rich without being heavy, thanks to tender strips of flank steak and earthy mushrooms simmered in a savory broth. The swirl of sour cream brings a creamy tang, while cabbage noodles add a low-carb, nutrient-packed alternative to pasta.

This recipe is cozy and hearty, with old-school comfort food vibes but a fresh, wholesome twist. It’s perfect for meal prepping or serving to a hungry crowd, and it tastes even better the next day. Plus, it uses simple ingredients and comes together with minimal fuss, making it a great go-to for weeknight dinners.

Why You’ll Love This Easy Flank Steak and Mushroom Soup

This soup brings together everything you want from a comforting dinner: richness, depth, and creamy satisfaction. The flank steak is thinly sliced and seared until just browned, locking in flavor. Mushrooms add a deep, earthy savoriness that pairs beautifully with the tangy sour cream stirred in at the end. And cabbage noodles? They’re not only a smart low-carb swap but also soak up the broth for the perfect bite.

Even better, it all comes together in one pot, and it’s easy to customize based on what you have on hand. Want it spicier? Add a pinch of red pepper flakes. Need it dairy-free? Swap the sour cream for a plant-based version. It’s endlessly flexible and always delicious.

What Kind of Flank Steak Should I Use?

Go for fresh flank steak that has good marbling without being overly fatty. When sliced thinly against the grain, it becomes tender and flavorful, especially when simmered gently in broth. You can also use skirt steak or even sirloin in a pinch, though flank steak holds up best in the soup’s simmering process.

If you want to make prep easier, ask your butcher to slice the steak thinly for you. Or partially freeze the meat before slicing—it’ll make it easier to get those paper-thin strips that cook up beautifully in your soup.

Ingredients for the Easy Flank Steak and Mushroom Soup with Sour Cream and Cabbage Noodles

This recipe is built on accessible ingredients that come together to create layers of flavor. Each one has a purpose, whether it’s to add depth, creaminess, or freshness. Here’s what you’ll need to bring this soup to life:

Flank steak
Olive oil
Onion
Garlic
Mushrooms
Beef broth
Sour cream
Green cabbage
Salt and pepper
Paprika
Bay leaf
Fresh dill (optional)

The flank steak is the star, offering tender bites of beef that infuse the broth with meaty richness. Olive oil helps sear the steak and soften the aromatics. Onion and garlic form the soup’s savory backbone, while mushrooms add that earthy depth. Beef broth provides the base and binds the flavors together.

Sour cream gives a tangy, creamy finish that balances the hearty meat and mushrooms. Green cabbage is sliced into noodle-like ribbons, acting as our satisfying, low-carb noodle swap. A simple mix of salt and pepper with a hint of paprika and a bay leaf round things out. And if you’re feeling fancy, a sprinkle of fresh dill at the end adds brightness.

How To Make the Easy Flank Steak and Mushroom Soup with Sour Cream and Cabbage Noodles

Step 1: Sear the Steak

Heat a tablespoon of olive oil in a large soup pot or Dutch oven over medium-high heat. Add the thinly sliced flank steak and sear for 2-3 minutes until browned. Remove the steak from the pot and set aside.

Step 2: Build the Base

In the same pot, add a bit more olive oil if needed, then sauté the chopped onion and garlic until fragrant and translucent, about 4-5 minutes.

Step 3: Cook the Mushrooms

Toss in the sliced mushrooms and cook until they release their moisture and become golden brown, around 6-8 minutes. Season with salt, pepper, paprika, and toss in the bay leaf.

Step 4: Simmer the Soup

Pour in the beef broth and bring to a simmer. Return the steak to the pot, reduce heat to low, cover, and let it all simmer together for 20-25 minutes.

Step 5: Add the Cabbage

Stir in the thinly sliced cabbage and simmer for another 10 minutes, just until the cabbage softens but still has a bit of bite.

Step 6: Finish with Sour Cream

Turn off the heat and remove the bay leaf. Stir in the sour cream until fully blended into the broth. Taste and adjust seasoning if needed.

Step 7: Garnish and Serve

Ladle the soup into bowls and top with fresh dill if desired. Serve hot and enjoy every creamy, savory spoonful.

How to Serve and Store This Soup

This easy flank steak and mushroom soup feeds about four generous servings, making it ideal for family dinners or a week of hearty lunches. It serves beautifully in deep bowls, finished with a dollop of extra sour cream and a scatter of fresh dill. You can even pair it with warm crusty bread if you’re not avoiding carbs, or a slice of low-carb rye for something lighter.

To store leftovers, let the soup cool completely, then transfer it to airtight containers. It will keep well in the fridge for up to 4 days. For longer storage, freeze in portioned containers for up to 2 months. Reheat gently on the stovetop or in the microwave, stirring well to reincorporate the sour cream into the broth.

What to Serve With Easy Flank Steak and Mushroom Soup

Herby Chicken Meatball Bowl

This is a great complement if you’re feeding a bigger crowd and want to keep the protein variety going. These bowls add balance and brightness.

Easy Homemade Naan Bread

Soft and chewy naan is perfect for soaking up the creamy, beefy broth. Plus, it’s easy to make and warms up beautifully.

Creamy Tomato Spinach Pasta

Serve a small portion alongside your soup for an ultra-comforting, indulgent dinner. The tomato and spinach give it a fresh contrast.

Roasted Asparagus

A simple side that adds a little crispness and greenery to the meal. Roast until golden for that caramelized finish.

Garlic Butter Chicken Balls with Parmesan Pasta

Want to turn this into a feast? Add a plate of these juicy chicken bites for a family-style spread.

Classic Caprese Salad

Light and refreshing, this helps cut through the richness of the soup and brightens up your plate with tomatoes and basil.

Creamy Lemon Butter Salmon

Another rich main that actually works well with this soup, especially for dinner parties. Fish and beef? It’s a luxe combo.

Creamed Cabbage and Ground Beef Casserole

If you’re meal prepping, make this casserole too—it uses similar ingredients and turns into a great companion dish.

Want More Soup Ideas with a Twist?

If you’re loving this easy flank steak and mushroom soup, there are plenty more comforting and creative options you might enjoy:

Try the Creamy Parmesan Italian Sausage Soup for a rich, cheesy broth with bold flavor.
The Creamy Smothered Chicken with Spinach, Potatoes, and Mushrooms offers a stew-like meal packed with veggie goodness.
Cozy up with this hearty Crab and Shrimp Seafood Bisque, especially if you’re craving something coastal.
You might also love this Creamy Cottage Cheese Pasta Sauce over noodles or veggies.
For another beefy dinner winner, check out the French Onion Ground Beef and Rice Casserole.

Save This Recipe For Later

📌 Save this recipe to your Pinterest soup board so you can come back to it any time.

And let me know in the comments how yours turned out. Did you go heavy on the dill? Maybe added a splash of red wine? Or did you make it low-fat?

I love seeing how others bring their own twist to these recipes. Ask questions if you have them too—let’s make soup magic together.

Explore beautifully curated health-boosting drinks and everyday comfort meals on Janet Dishes on Pinterest and discover your new go-to favorites.

Conclusion

Easy Flank Steak and Mushroom Soup with Sour Cream and Cabbage Noodles is everything cozy food should be: hearty, flavorful, and soul-warming. It turns simple ingredients into a meal that feels both rustic and elevated, perfect for busy nights or when you’re craving something deeply satisfying. Make it once and you’ll be returning to this bowl again and again.