Slow Cooker Leek and Potato Soup

4.94 from 15 votes
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This Slow Cooker Leek and Potato Soup, also known as Vichyssoise Soup, is perfect for a cozy winter meal. It is a nutritious vegetarian dinner that the whole family can enjoy.

Potato Leek Soup in a bowl with a spoon.


Slow Cooker Leek And Potato Soup Recipe

Tender potatoes and flavorful leeks are blended up to a creamy and dreamy perfection to make this amazing Potato Leek Soup. Also called potage parmentier, this soup makes for a perfect light lunch or works great as a starter to a fabulous dinner.

One of the joys of using a slow cooker for this particular soup recipe is the depth of flavor you achieve. As the ingredients simmer together over several hours, they meld in harmony, deepening the soup’s character. Plus, the convenience factor is hard to beat. Just set it up, go about your day, and return to a warm, ready meal. And, lemme tell you – this soup is rich, a bit creamy, a bit chunky, a whole lot of wonderful, and is also great chilled! The chilled version of it is called Vichyssoise. So fancy, right? The flavor, the texture, and everything all together is like getting a hug from a soup bowl. 

Potato Leek Soup in the Slow Cooker.

Why You’ll Love This Soup

  • Versatility in Serving: Serve the soup warm with crusty bread on a cold day, or chill it for a refreshing summer appetizer. You can also play around with toppings: consider a sprinkle of crispy bacon, a dollop of sour cream, or even some grated cheddar.
  • Meal Prep Friendly: This soup is a meal prepper’s dream! It stores beautifully in the refrigerator for up to a week, and its flavors continue to meld and intensify over time. If you’re looking to stretch it out further, it freezes wonderfully, too.
  • Vegetarian Delight: While many soups rely on chicken or beef broth for their base, this one celebrates the richness of vegetables alone, making it a perfect option for vegetarians. And for our vegan friends, you can easily omit the butter and heavy cream or substitute them with plant-based alternatives.

How To Make Leek and Potato Soup In The Slow Cooker

I want to call this a back-to-basics recipe because it’s very simple and easygoing, and you might already have all the ingredients hiding in the pantry. The best part is that you can prep this in the morning and leave it to cook for the whole day. By the way, you only need carrots, celery, garlic, leeks, potatoes, fresh thyme, salt, pepper, and butter. AND a Slow Cooker

  1. Cut the potatoes and the leeks. Leeks may need to be washed before cutting because dirt likes to hide in places you can’t see. Just cut off the dark green part, then cut the leeks in half lengthwise, and rinse under cold water. Pat dry with paper towels and chop them up.
  2. Put potatoes and leeks in the slow cooker and set aside.
  3. Combine sliced carrots and celery in a skillet and sauté for 4 minutes; stir in some garlic and transfer it all to the slow cooker.
  4. Stir in vegetable broth; add fresh thyme sprigs and butter.
  5. Close with the lid and cook on LOW for 6 to 8 hours, or until potatoes are very tender. You can also cook it on HIGH for 4 to 5 hours.
  6. When done, blend the soup with an immersion blender. If you only have a traditional blender, blend in batches. I also advise not to blend it at high speed; pulse it so that you have more control of the texture in the end. The finishing touch should involve some heavy cream – totally optional but totally necessary. 😉
Leek and Potato Soup in a ladle.

Tips For Perfect Leek And Potato Soup

  • Cleaning Leeks: Leeks can trap a lot of dirt between their layers. To clean, slice off the dark green parts, cut the white and light green parts in half lengthwise, and rinse thoroughly under running water, fanning out the layers.
  • Consistent Sizing: Ensure that your potatoes are cut into roughly even sizes. This helps them cook uniformly.
  • Seasoning: Potatoes tend to absorb a lot of salt, so always taste and adjust your seasoning before serving. A splash of lemon juice or white wine vinegar can also brighten the flavors.
  • Smooth or Chunky: If you like a chunkier texture, only blend a portion of the soup, leaving some potato and leek pieces whole. Conversely, for a smoother soup, blend thoroughly.
  • Protein Boost: Add white beans, lentils, or even diced chicken for a protein-packed version.
  • Spicy Kick: Add a finely chopped chili pepper or a dash of cayenne pepper to introduce a warm heat to your soup.
  • Cheesy Delight: Stir in some grated cheddar, gruyère, or your cheese of choice for a richer, cheesier soup.
Potato Leek Soup in a bowl garnished with parsley and fresh thyme.

Serving Suggestions

  • Serve This Soup As A Main Course. When serving soup as a main, be generous with the portion size. Offering a larger bowl will ensure it feels like the meal’s centerpiece. Also, accompany the soup with substantial sides: crusty focaccia bread, a slice of quiche, a stuffed roll, or a mixed green goddess salad. Top your soup with flavorful garnishes. This could be fresh herbs, grated cheese, a swirl of cream, toasted seeds, or even a sprinkle of spice.
  • Serve As a Side Dish. If you want to make the Potato Leek Soup a starter or a complement to a main course, consider serving this Roasted Chicken as a main meal or my Churrasco Steak. For a vegetarian spin, serve it with my Tomato Tart or my Creamy Parmesan Baked Zucchini.


  • Leftovers: Store soup in an airtight container and keep in the fridge for up to 3 days.
  • To freeze: Potato Leek Soup can be frozen for 3 months, but don’t add the cream if you plan to freeze it. 

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4.94 from 15 votes

Slow Cooker Leek And Potato Soup

This Slow Cooker Leek And Potato Soup is perfect for a cozy winter meal. Also called potage parmentier, this soup is a nutritious vegetarian dinner idea for the whole family.
Prep Time: 10 minutes
Cook Time: 8 hours
Total Time: 8 hours 10 minutes
Servings: 8


  • 2 pounds Yukon Gold Potatoes,, peeled and quartered
  • 3 leeks,, white and light green parts only,  roughly chopped
  • 1 tablespoon olive oil
  • 1 large carrot,, sliced
  • 3 celery ribs,, sliced
  • 3 cloves garlic,, minced
  • teaspoons salt,, or to taste
  • ½ teaspoon fresh ground black pepper,, or to taste
  • 6 to 8 cups low sodium vegetable broth
  • 2 tablespoons butter
  • 3 sprigs fresh thyme
  • ½ cup heavy cream,, optional
  • chopped fresh parsley, , for garnish, optional
  • fresh thyme leaves,, for garnish, optional
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  • Place chopped potatoes and leeks inside the slow cooker and set aside.
  • Heat olive oil in a skillet and add carrots and celery; cook for 4 minutes. Stir in garlic and cook for 20 seconds. Add the carrot mixture to the slow cooker. Stir in the vegetable broth and add the butter and thyme sprigs.
  • Cover with the lid and cook on LOW for 6 to 8 hours or until the potatoes are very tender. You can also cook it on HIGH for 4 to 5 hours.
  • When done, remove the thyme sprigs and, if using, stir in the heavy cream.
  • Blend the soup with an immersion blender. If you only have a traditional blender, blend it in batches. Taste the soup for seasonings and adjust accordingly.
  • If the soup is too thick for your liking, add more vegetable broth to thin it out.
  • Ladle the soup into bowls and garnish with parsley and fresh thyme leaves.
  • Serve.


  • Leeks: Ensure leeks are washed thoroughly to remove trapped dirt between layers
  • Soup Texture: For a chunkier texture, blend only part of the soup. For smoother, blend thoroughly.
  • Avoid Curdling: Introduce the heavy cream off the heat so that it doesn’t curdle.
  • Seasoning: Adjust salt as needed before serving. A hint of lemon juice can also enhance the flavors.
  • To freeze: Potato Leek Soup can be frozen for 3 months, but don’t add the cream if you plan to freeze it. When ready to serve it, defrost the soup in the refrigerator overnight; reheat it on the stovetop over medium heat until hot. Once heated through, stir in heavy cream and bring to a simmer; remove from heat and serve.


Serving: 1cup | Calories: 159kcal | Carbohydrates: 26g | Protein: 5g | Fat: 5g | Saturated Fat: 2g | Cholesterol: 8mg | Sodium: 473mg | Potassium: 608mg | Fiber: 4g | Sugar: 4g | Vitamin A: 2396IU | Vitamin C: 20mg | Calcium: 71mg | Iron: 5mg

Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.

Did you make a recipe? Leave a rating

Can I brag for a sec?! This soup right here? It was given 5 stars by the team many years ago. Yeppers, it was! 🙌 That was one fantabulous day in the life of Diethood. I was just starting this whole recipe blog deal, and that review meant so much to me! STILL DOES! ❤️ Originally published on December 9th, 2012

4.94 from 15 votes (5 ratings without comment)

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Recipe Rating:


  1. AngieW says:

    Absolutely delicious!!

    1. Katerina Petrovska says:

      Thank you so much! 🙂

  2. Erin | Dinners,Dishes and Dessert says:

    This looks absolutely delicious! Yummy!

  3. Catalina says:

    The soup season is on! This recipe sounds easy and delicious!

  4. Taylor says:

    So creamy with delicious flavor. Yum!!

  5. Cathy says:

    Ohhh yes I’m definitely making this yummy soup!!

  6. Chrissie Baker says:

    This potato look soup looks incredible and oh so rich! And love that you can make it in the slow cooker.

  7. Dorothy Reinhold says:

    The Instant Pot has changed my soup game. It makes soup in no time with developed flavors! This looks hearty and delicious!

  8. Laura Reese says:

    This soup is perfect for cool fall nights. I love the flavors you’ve put together potatoes and leeks.

  9. Anna says:

    No wonder this soup got rave reviews! It’s DELICIOUS! Currently my favorite fall soup. Thank you for the recipe!

  10. Katie says:

    This soup looks absolutely delicious! Makes me want to curl up on the couch with a big bowl of it!