Few soups prove how much you can do with a handful of simple ingredients quite like potato leek soup. Mild, sweet leeks slowly softened in butter combine with tender potatoes and broth before everything is blended into a velvety soup and finished with cream. The result is rich and comforting without requiring a complicated ingredient list.
This is the kind of soup that feels especially welcome on a chilly fall or winter evening, but it is simple enough to make whenever you happen to bring home a bundle of fresh leeks. Serve it with crusty bread for dipping, pair it with a salad for a light meal, or make a pot ahead of time and enjoy it for lunch over the next few days.
🥔 Classic Creamy Potato Leek Soup Recipe
Prep time: 20 minutes
Cook time: 35 minutes
Servings: 6
Ingredients
- 4 large leeks, white and light green parts
- 2 tablespoons unsalted butter
- 2 pounds potatoes, peeled and cut into 1-inch pieces
- 4 cups chicken or vegetable broth
- 1 teaspoon kosher salt, plus more to taste
- 1/2 teaspoon freshly ground black pepper
- 1 cup heavy cream
- 2 tablespoons chopped fresh chives, for serving
- Freshly ground black pepper, for serving
🌿 How to Clean Leeks Properly
Leeks are wonderful in soup, but they are also very good at hiding soil between their tightly packed layers. Giving the outside a quick rinse usually is not enough.
Trim away the root ends and the tough dark green tops, leaving the white and tender light green portions. Slice the leeks lengthwise and then into half-moons.
Place the sliced leeks in a large bowl of cold water and swish them around with your hands. Any sand or soil trapped between the layers will loosen and sink toward the bottom of the bowl.
Lift the clean leeks out of the water rather than pouring everything through a colander, which can dump the grit right back over them. Drain well before cooking.
The dark green leek tops do not necessarily need to go into the trash. Although they can be too tough for this creamy soup, they can be washed thoroughly and saved for making homemade vegetable or chicken stock.
🧈 Slowly Soften the Leeks
Melt the butter in a large Dutch oven or heavy soup pot over medium-low heat.
Add the cleaned and sliced leeks along with a small pinch of salt. Cook for about 8 to 10 minutes, stirring occasionally, until the leeks become very soft.
Try not to brown them. The goal is to gently soften the leeks and bring out their mild sweetness rather than develop the deeper caramelized flavor you might want from onions in another recipe.
Once softened, the leeks should look silky and considerably reduced in volume.
🥔 Add the Potatoes and Broth
Add the diced potatoes, broth, salt, and black pepper to the pot.
Increase the heat and bring everything to a gentle boil. Reduce the heat to maintain a simmer, partially cover the pot, and cook for approximately 15 to 20 minutes.
The potatoes should become completely tender. Test a piece with the tip of a knife or fork; it should slide through easily without resistance.
You want the potatoes quite soft because they will form the creamy foundation of the soup once everything is blended.
🥣 Blend Until Smooth and Creamy
Remove the pot from the heat and use an immersion blender to purée the soup until smooth.
Move the blender slowly around the pot, making sure to catch any pieces of leek or potato hiding around the edges.
If you do not have an immersion blender, you can use a countertop blender instead. Work carefully in batches and avoid filling the blender too full with hot soup. Follow the manufacturer’s instructions for blending hot liquids.
You can blend the soup completely smooth or stop while there are still a few small pieces of potato remaining if you prefer a little more texture.
🥛 Finish with Heavy Cream
Return the pot to low heat and stir in the heavy cream.
Warm the soup gently until it is hot throughout, but there is no need to bring it back to a vigorous boil.
Taste and adjust the salt and black pepper. Potatoes can absorb quite a bit of seasoning, so tasting the soup at the end is important.
If the soup becomes thicker than you would like, stir in a little additional broth until it reaches your preferred consistency.
Ladle the soup into warm bowls and finish with chopped fresh chives and plenty of freshly cracked black pepper.
🥔 Which Potatoes Are Best for Potato Leek Soup?
Russet potatoes make a particularly smooth and velvety potato leek soup because of their relatively high starch content. As they cook and break down, they naturally help thicken the soup.
Yukon Gold potatoes are another excellent choice. They produce a slightly denser texture with a naturally rich, buttery flavor.
You can also use a combination of Russets and Yukon Golds if you have both on hand. There is no need to buy a particular variety simply to make the soup—the important thing is cooking the potatoes until thoroughly tender before blending.
🌿 What Do Leeks Taste Like?
Leeks belong to the same broad family of vegetables as onions, garlic, scallions, and chives, but their flavor is generally milder and sweeter than an ordinary yellow onion.
That gentle flavor is exactly what makes them so well suited to soup. They provide plenty of savory character without overwhelming the potatoes or cream.
Cooking them slowly in butter softens their flavor even further and creates the mellow base that gives potato leek soup its distinctive taste.
🥛 Do You Have to Add Cream?
Not at all.
The potatoes themselves provide much of the creamy texture once the soup is blended, so you can reduce the amount of heavy cream or leave it out entirely.
For something lighter, substitute half-and-half or whole milk. Just avoid boiling the soup aggressively after adding milk, particularly if using a lower-fat dairy product.
For a dairy-free version, sauté the leeks in olive oil instead of butter and omit the cream. Unsweetened unflavored oat milk or another neutral dairy-free alternative can also work if you want a creamier finish.
🧄 Can You Add Garlic?
Absolutely. While a simple potato leek soup does not need garlic, it is an easy variation.
Add two or three finely minced garlic cloves during the final minute of cooking the leeks. Stir constantly so the garlic becomes fragrant without browning.
Garlic gives the soup a slightly stronger savory flavor while still allowing the leeks and potatoes to remain the stars.
🌱 Herbs That Work Well with Potato Leek Soup
Chives are one of the easiest garnishes because their fresh onion flavor naturally complements the leeks.
Fresh thyme is another excellent choice. Add several sprigs to the broth while the potatoes simmer and remove the woody stems before blending.
Parsley provides a fresher, greener flavor, while a very small amount of rosemary can work if you prefer a more aromatic soup.
You can also add a bay leaf while the soup simmers. Just remember to remove it before blending.
🥓 Add Bacon for a Smoky Version
Crispy bacon turns this simple soup into something considerably heartier.
Cook several strips of bacon in the soup pot first, then transfer them to a paper towel-lined plate. Leave a small amount of bacon fat in the pot and use it along with the butter to soften the leeks.
Crumble the bacon over individual bowls just before serving so it stays crisp.
A little shredded sharp cheddar alongside the bacon can push the soup in the direction of a loaded baked potato, which is particularly good when you want a more substantial meal.
🧀 Other Toppings to Try
Potato leek soup has such a simple flavor that toppings can change its personality quite a bit.
Try shredded cheddar, Gruyère, Parmesan, crispy bacon, homemade croutons, toasted pumpkin seeds, a spoonful of sour cream, or a drizzle of good olive oil.
Fresh herbs are especially useful because they add both color and brightness to an otherwise pale soup.
You could even set out several toppings and let everyone finish their own bowl at the table.
🍞 What to Serve with Potato Leek Soup
Crusty bread may be the perfect companion. A slice of sourdough, French bread, or rustic country bread is ideal for soaking up every last bit of soup.
Grilled cheese also makes a satisfying combination, particularly for lunch or a casual dinner.
If you want something lighter, serve the soup with a crisp green salad dressed with vinaigrette. The acidity in the dressing provides a nice contrast to the creamy potatoes.
For a larger meal, potato leek soup can also be served as a starter before roasted chicken, pork, beef, or a vegetarian main course.
🥣 How to Make Chunky Potato Leek Soup
Not everyone wants a completely smooth soup.
For a chunkier version, remove a cup or two of the cooked potatoes and leeks before blending. Purée the remaining soup, stir in the cream, and then return the reserved vegetables to the pot.
You will still get the creamy texture created by blended potatoes while retaining tender pieces in every bowl.
Another option is to blend only half of the soup with an immersion blender. This creates a naturally rustic texture without requiring another bowl.
🧑🍳 How to Fix Soup That Is Too Thick
Potato soup tends to thicken as it sits, particularly after refrigeration.
If it becomes too thick, simply add additional broth a little at a time while reheating. Milk or cream can also be used when you want to maintain a particularly rich consistency.
Add the liquid gradually. It is easy to thin soup but considerably harder to make it thick again once you have added too much.
💧 What If the Soup Is Too Thin?
If your potato leek soup seems thinner than you would like, let it simmer gently uncovered for several minutes so some of the liquid can evaporate.
You can also blend in a few additional cooked potatoes if you happen to have them available.
Avoid adding flour unless absolutely necessary. The potatoes should provide enough natural thickening for this style of soup.
🧊 How to Store Leftover Potato Leek Soup
Allow leftover soup to cool promptly and transfer it to shallow airtight containers before refrigerating.
Properly refrigerated soups and stews should generally be used within 3 to 4 days.
Reheat only the amount you plan to eat and warm it gently on the stovetop, stirring occasionally. Because the soup will probably thicken in the refrigerator, you may want to add a splash of broth while reheating.
❄️ Can You Freeze Potato Leek Soup?
Potato leek soup can be frozen, although potatoes and cream can both undergo some textural changes after freezing and thawing.
For the best results, freeze the soup before adding the heavy cream. Allow the blended potato-and-leek base to cool, transfer it to freezer-safe containers, and leave a little room for expansion.
After thawing, reheat the soup gently and stir in fresh cream just before serving.
If you freeze the finished creamy soup, it may separate slightly when thawed. Gentle reheating and a quick blend with an immersion blender can often bring it back together.
🍂 A Simple Soup for Cold Days
There is nothing flashy about potato leek soup, and that is exactly part of its charm.
A few ordinary ingredients—leeks, potatoes, butter, broth, and cream—slowly transform into something smooth, warming, and deeply comforting. The mild sweetness of the leeks keeps the soup interesting while the potatoes give it enough body to feel satisfying.
Make a pot on a cold afternoon, slice some crusty bread, and keep the toppings simple. Sometimes the best soups are the ones that let a few good ingredients do all the work.
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