Potato Leek Soup
Potato leek soup is a creamy, comforting classic made by gently cooking sliced leeks and cubed potatoes in vegetable stock, blending everything until smooth, and finishing with a swirl of cream. The result is a velvety bowl with a delicate, mellow flavor: the leeks bring a soft sweetness that sits somewhere between onion and garlic, while the potatoes give the soup its naturally thick, silky body. It is the kind of soup that warms you up on cool spring days without weighing you down.
Best of all, it asks very little of you. A handful of pantry vegetables, one pot, and about half an hour turn into something that tastes far richer than the effort suggests.
A Cozy Bowl With Humble Roots
Leek and potato soup belongs to the tradition of comforting European home cooking, born in regions that have grown leeks and potatoes for centuries. Both vegetables store well through the colder months, which is part of why this pairing became such a staple of everyday kitchens. It is modest food with a lot of heart, the sort of thing you make when you want something nourishing without any fuss. If you enjoy this style of cooking, you will find plenty more in our collection of traditional European recipes.
What Goes Into This Soup
The ingredient list is short and forgiving, which is a big part of the appeal. Here is what each component brings to the pot:
- Leeks (the white part of 4 stalks, sliced): the backbone of the flavor. The white and pale sections are tender and mildly sweet, gentler than an onion.
- White potatoes (1 kg, peeled and cubed): they soften and break down as they cook, giving the soup its creamy body without much help.
- Butter (3 tablespoons): used to sweat the leeks and garlic slowly so they turn soft and golden.
- Garlic (3 cloves, crushed): a quiet layer of savory depth in the background.
- Vegetable stock (7 cups): the cooking liquid that carries all the flavor. A good stock makes a real difference here.
- Bay leaves and fresh thyme (2 leaves, 3 sprigs): woodsy aromatics that infuse while the potatoes simmer, then get lifted out before blending.
- Salt and black pepper: to season and balance.
- Liquid cream (1 cup): stirred in at the end for that rounded, luxurious finish.
- Chives (½ cup, chopped): a fresh, oniony sprinkle to serve.
Tips for the Silkiest Texture
This soup is hard to get wrong, but a few small habits make the difference between good and velvety-smooth:
- Sweat the leeks slowly. Give them the full 10 minutes over medium heat until soft and slightly golden. Rushing this or letting them scorch will bring a bitter edge.
- Cut the potatoes evenly. Uniform cubes cook at the same rate, so nothing stays hard once the rest is tender.
- Simmer until fork-tender. The potatoes need to be fully soft (about 15 minutes covered) before blending, or the soup will not turn creamy.
- Fish out the aromatics first. Remove the thyme sprigs and bay leaves before you blend, so no woody bits end up in the puree.
- Blend thoroughly. An immersion blender right in the pot is the easiest route. Work carefully, since the soup is hot.
- Add the cream at the very end. Stir it in over low heat for 2 to 3 minutes and avoid a hard boil, which can cause dairy cream to separate.
How to Make It Dairy-Free
As written, this recipe is vegetarian because it uses butter and dairy cream, but it converts to a fully plant-based soup with two easy swaps. Use the same amount of olive oil or a neutral oil in place of the butter to soften the leeks, then replace the liquid cream with a plant-based cooking cream, or a generous splash of oat milk or rice milk for a lighter finish. The potatoes are already doing most of the thickening, so you will barely notice the change. For more ideas on swapping out dairy, take a look at our guide on how to replace dairy in your diet.
What to Serve Alongside
A bowl of potato leek soup is a meal on its own, but a few simple additions round it out nicely. Serve it with crusty bread or garlic toast for dipping, a crisp green salad on the side, or a handful of croutons on top. Finish each bowl with the chopped chives, a drizzle of olive oil, and a little cracked pepper for contrast.
If you are building a whole soup rotation for the season, there are plenty more creamy options to explore. Try our cream of potato and carrot soup, the earthy cream of mushroom soup with thyme, a bright cream of broccoli soup, or the delicate creamy scallion soup. For a lighter, all-vegetable bowl, the cream of vegetables soup and creamy green pea soup are both lovely.
Storing and Reheating Leftovers
Leftover soup keeps well in an airtight container in the fridge for up to 3 to 4 days. Reheat it gently on the stove over low to medium heat, stirring now and then, and stop short of a rolling boil so the cream stays smooth. If it has thickened in the fridge, loosen it with a splash of stock or water until it reaches the consistency you like.
Cream-based soups can turn a little grainy after freezing and thawing. If you want to make a batch for the freezer, freeze the blended soup before you add the cream, then stir in fresh cream when you reheat it. That small step keeps the texture silky.
If this potato leek soup brings a little comfort to your table, I would love to hear about it. Leave a star rating and a comment below to tell me how yours turned out, and whether you kept it classic with cream or gave it a dairy-free twist.
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Potato Leek Soup
Ingredients
- 3 tablespoons butter
- 4 leek stalks only the white part, sliced
- 3 cloves garlic crushed
- 1 kg white potatoes cleaned and cut into cubes
- 7 cups vegetable soup/stock
- 2 bay leaves
- 3 sprigs fresh thyme
- 1 teaspoon salt
- ½ teaspoon black pepper
- 1 cup liquid cream
- ½ cup chives chopped
Instructions
- In a large pot, over medium heat, add the butter. When the butter is melted, add the sliced leek, the crushed garlic and cook, stirring, for 10 minutes, until the leek becomes soft and slightly golden.
- Add the potatoes, soup, bay leaves, thyme, salt and pepper and leave on high heat until the herbs. When it has boiled, leave the fire low and cover with a lid. Let it cook for 15 minutes or until the potatoes are soft.
- Remove the thyme sprigs and bay leaves from the pot.
- Then puree with a blender until the composition becomes creamy.
- Add liquid cream over the creamy soup and mix to incorporate, leave on low heat for another 2-3 minutes.
- Serve the soup hot, sprinkled with chopped chives.
Frequently Asked Questions
As written, this recipe is vegetarian because it uses butter to cook the leeks and dairy liquid cream to finish the soup. It is easy to make vegan: swap the butter for olive oil and use a plant-based cooking cream, oat milk, or rice milk in place of the dairy cream. The rest of the ingredients are already plant-based.
White, starchy potatoes work best here. They soften and break down as they cook, so they thicken the soup and give it a creamy body without needing much cream. Cut them into evenly sized cubes so they all cook through at the same rate.
The white and pale-green parts of the leek are tender and mildly sweet, which is exactly the delicate flavor this soup is after. The dark green tops are tougher and more fibrous, so they are better saved for making stock. Whichever part you use, slice and rinse the leeks well, since grit likes to hide between the layers.
Not strictly. Once the cooked potatoes are blended, they give the soup a naturally smooth, thick texture on their own. The cup of liquid cream at the end adds extra richness and a rounded finish, but you can reduce it, skip it, or use a plant-based cream if you prefer a lighter bowl.
Yes. It keeps in an airtight container in the fridge for up to 3 to 4 days and reheats gently on the stove. For freezing, it is best to freeze the blended soup before adding the cream, since cream-based soups can turn grainy once thawed. Stir in fresh cream when you reheat it.
Add the liquid cream only at the end, over low heat, and let it warm through for 2 to 3 minutes. Avoid bringing the soup to a hard boil after the cream goes in, because boiling can cause dairy cream to separate or split. Gentle heat keeps it smooth.
Perfect way to start this season!