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Slow Cooker Potato Leek Soup

Potato Leek Soup is rich, creamy, comfort food that will warm you from the inside. Hearty potatoes and mild green leeks slow simmered all day make a great meal to come home to.

soup with swirl of sour cream on top

Slow Cooker Potato Leek Soup Recipe

This creamy and silky soup is one of my favorites and also the simplest soup to make. With only 3 basic ingredients, this humble soup recipe is still the richest in my opinion.

When my son (huge potato lover) tasted it for the first time he called it runny mashed potatoes LOL.

This classic French recipe, called “Vichyssoise” if served chilled, is perfect for a comforting dinner at home or elegant enough for any fancy dinner party!

Not only is it easy, it’s versatile. Think of all the delicious ways you can add flavor and texture to the base and you can have several soup variations at your fingertips.

But first things first…

What are leeks?

Leeks are members of the onion family, native to the Mediterranean region. Grown in sandy soil, they are tall stalks with bright green tops and white bulbs.

They look much like your typical green onion but much larger. Though they are bigger, their flavor is milder.

Because of this, they pair perfectly with the starchy potatoes in this soup.

labeled picture of soup ingredients

Ingredients Needed

  • butter
  • leeks
  • Russet potatoes
  • chicken broth
  • herbs & spices (bay leaf/thyme)

What are the best potatoes to use for soup

I like to use Russet potatoes because of the high starch content. This gives the soup a thick and silky texture! But feel free to use any starchy potato you like.

How to clean and cut leeks for soup

Because of the sandy soil, leeks tend to have grit or dirt inside their layers. There are a couple of ways to clean them but I have a trick that works great when you are slicing them.

  1. trim off the roots and the dark green fibrous tops, leaving only the tender light green/white part of the stalk.
  2. slice crosswise in 1/8 to 1/4 inch slices.
  3. place the slices in a large bowl with plenty of water. Using your fingers, separate the “rings” of layers in the slices. (Like tiny green onion rings)
  4. agitate and move the slices around to dislodge the dirt. Let the leeks settle in the bowl and the dirt will fall to the bottom of the bowl and the leeks will float.
  5. gently remove just the leek slices and transfer to a paper towel to drain. Proceed with your recipe.

Alternatively, you can slice the leeks lengthwise and separate the layers and rinse/wipe off much like you would celery stalks. Either way, be sure to get all the dirt off so it doesn’t end up in your soup.

Looking for more leftover worthy dishes? Follow LTB on Pinterest and pin to a board!

How to make slow cooker potato leek soup

First: Peel and dice the potatoes. Clean and prep the leeks. In a skillet, melt the butter and saute the leeks until soft.

Second: Place leeks in a crockpot with diced potatoes, broth, and spices.

Third: Cook on low 6-8 hours or on high 2-3 hours or until the potatoes are tender.

Fourth: When ready to serve, use a hand blender or transfer soup to a blend and puree until smooth. Season with salt and pepper if desired. Garnish, serve, and enjoy!

For the full recipe and detailed baking instructions, please see the recipe card at the end of this post.

How long will potato leek soup last?

If you have any leftovers, you can keep them stored in the fridge in an air tight container for up to 5 days. The soup may thicken as it sits, just add a little more broth or milk to the soup when you reheat it.

ladle of soup

Can I make this in the instant pot?

You sure can! Sauté the leeks in butter in the pot on the sauté function. Add the remaining ingredients, cook on low pressure for 7 minutes.

Let the steam release naturally for 15 minutes then do a quick release. Puree the soup and add your garnishes. You can also make this on the stove top in a large pot or a dutch oven.

With minimal prep, let your crockpot do all the work!

spoon full of soup with garnish

Tips for No Leftovers

  • When prepping your potatoes, keep them in water so they don’t turn brown. This will make your soup brown 🙁
  • Make sure your leeks are very clean or the soup will be gritty.
  • Save some of the cooked leeks to garnish the soup.
  • I like to use chicken stock but feel free to make this vegetarian by using vegetable broth.
  • Add 1/4 cup heavy cream just before serving to add some extra richness.
  • Garnish with sour cream, cheddar cheese, and/or cooked crumbled bacon for even more flavor and texture.
  • Add garlic to your leeks and spice it up with some chopped green chilies.

If you love this recipe as much as I do, please write a five-star review in the comment section below (or on Pinterest with the “tried it” button – you can now add pictures into reviews, too!), and be sure to help me share on facebook!

bowl of soup with text "how to make potato leek soup"

More Easy Dinners

soup in a bowl with a spoon

Potato Leek Soup

Yield: 12
Prep Time: 10 minutes
Cook Time: 4 hours
Total Time: 4 hours 10 minutes

Potato Leek Soup is rich, creamy, comfort food that will warm you from the inside.


  • 3 tablespoons butter
  • 3 leeks (trimmed, sliced)
  • 2 pounds potatoes (peeled, diced)
  • 6 cups chicken broth
  • 2 bay leaves
  • 1 tablespoon thyme
  • salt & pepper as needed


  1. In a skillet, melt the butter. Sauté the leeks until soft.
  2. Place leeks in a crock pot with diced potatoes, broth, and spices.
  3. Cook on low 6-8 hours or on high 2-3 hours or until the potatoes are soft.
  4. When ready to serve, use a hand blender or transfer soup to a blend and puree until smooth.
  5. Season with salt and pepper to taste. 


*If you love this recipe as much as I do, please leave me a comment and rate it 5 stars. Thank you!

Nutrition Information:
Yield: 12 Serving Size: 1 cup
Amount Per Serving: Calories: 113Total Fat: 3gSaturated Fat: 2gTrans Fat: 0gUnsaturated Fat: 1gCholesterol: 10mgSodium: 520mgCarbohydrates: 19gFiber: 2gSugar: 2gProtein: 3g

This nutrition information was generated via a third party, Nutritionix, and can not be held liable for any discrepancies in the information provided. Content and photographs are copyright protected. Sharing of this recipe is both encourages and appreciated. Copying and/or pasting full recipes to any social media is strictly prohibited.

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