Creamy Potato Leek Soup Recipe

Overview

This creamy potato leek soup recipe makes a smooth, comforting soup with tender potatoes, mellow leeks, and a gentle buttery richness. Sautéing the leeks first softens their sharpness and builds flavor before the broth and potatoes go into the pot.

The soup is blended until creamy, then finished with heavy cream for a silky texture. It is satisfying on its own with crusty bread, or you can serve it as a starter alongside a simple salad or sandwich.

Ingredients

• 3 large leeks, white and light-green parts only, about 1 1/2 pounds
• 2 tablespoons unsalted butter
• 1 tablespoon olive oil
• 1 medium yellow onion, finely chopped
• 2 garlic cloves, minced
• 2 pounds Yukon Gold potatoes, peeled and cut into 1-inch pieces
• 5 cups low-sodium chicken or vegetable broth
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• 2 sprigs fresh thyme, or 1/2 teaspoon dried thyme
• 1 bay leaf
• 1 cup heavy cream
• 1 tablespoon fresh lemon juice, optional
• Chopped fresh chives, sliced green onions, or extra black pepper, for serving

How to make it

1. Clean and slice the leeks. Trim away the roots and the dark-green tops, leaving the white and pale-green portions. Slice the leeks thinly, then place them in a bowl of cold water and separate the layers with your fingers. Let the grit sink, lift the leeks out, and drain well. Repeat if the water looks sandy.

2. Soften the aromatics. Melt the butter with the olive oil in a large Dutch oven or heavy pot over medium heat. Add the onion and leeks, along with 1/2 teaspoon of the salt. Cook for 8 to 10 minutes, stirring occasionally, until the leeks are very soft and glossy but not browned. If they begin to color, reduce the heat; the soup tastes best when the leeks are sweet and mellow rather than dark and toasted.

3. Add the garlic and potatoes. Stir in the garlic and cook for 30 seconds, just until fragrant. Add the potatoes, broth, remaining 1/2 teaspoon salt, pepper, thyme, and bay leaf. Stir and scrape the bottom of the pot to loosen any softened onion or leek.

4. Simmer until tender. Bring the broth to a gentle boil, then reduce the heat to medium-low. Partially cover the pot and simmer for 18 to 22 minutes, or until a potato piece can be easily pierced with a fork and almost falls apart. Avoid boiling hard, which can make the broth reduce too quickly before the potatoes are tender.

5. Remove the herbs and blend. Take out the bay leaf and thyme stems. For the smoothest soup, blend in batches in a countertop blender, filling the jar no more than halfway and venting the lid so steam can escape. Hold a folded kitchen towel over the lid and blend until smooth. Alternatively, use an immersion blender directly in the pot. Blend only until creamy; prolonged blending can make potatoes turn stretchy or gluey.

6. Add the cream. Return the blended soup to the pot if necessary and stir in the heavy cream. Warm it over low heat for 2 to 3 minutes without letting it boil. Taste and adjust with more salt and pepper. Add the lemon juice if the soup tastes heavy or flat; it should brighten the flavor without making the soup taste distinctly lemony.

7. Check the consistency and serve. If the soup is thicker than you like, stir in warm broth or water 2 tablespoons at a time. If it is too thin, simmer it uncovered over low heat for a few minutes, stirring often. Ladle into bowls and finish with chives, sliced green onions, black pepper, or a small drizzle of cream.

Expert tips

• Do not skip washing the leeks. Soil often collects between the layers, even when the outside looks clean.
• For a lighter soup, replace the heavy cream with half-and-half. Stir it in at the end and keep the soup below a boil.
• For a dairy-free version, use olive oil instead of butter and finish with unsweetened oat cream or full-fat coconut milk. Coconut milk will add a noticeable coconut flavor.
• For a chunkier texture, blend about two-thirds of the soup and leave the rest of the potato pieces whole.
• If the soup tastes bland, add salt gradually before adding more cream. Cream softens seasoning, so the final adjustment matters.
• If the soup becomes gluey, stop blending immediately and thin it with warm broth. Future batches should be blended briefly rather than processed for several minutes.
• For another smooth, blended soup idea, try this roasted butternut squash soup recipe, which gets its flavor from caramelized squash and onion.

Serving and storage

Serve the soup hot with crusty bread, garlic toast, or a simple green salad. Chopped chives, cracked black pepper, sautéed leek rings, or a spoonful of sour cream make easy toppings.

Let leftovers cool promptly, then transfer them to a covered container and refrigerate. Use within 3 to 4 days. Reheat gently in a saucepan over medium-low heat, stirring often; avoid a vigorous boil because cream-based soups can separate and potatoes can thicken the soup further. Add a splash of broth or water while reheating if needed.

The soup can also be frozen, but the texture may become slightly grainy after thawing because of the cream and potatoes. For the best result, freeze the blended soup before adding the cream, thaw it in the refrigerator, reheat gently, and stir in the cream just before serving. If you enjoy potato side dishes as well, these roasted garlic mashed potatoes use the same ingredients in a richer, spoonable format.

Frequently asked questions

Can I make potato leek soup without a blender?

Yes. For a rustic soup, mash some of the cooked potatoes against the side of the pot with a potato masher and leave the rest in small pieces. The soup will be creamy but not completely smooth.

Should I use the green part of a leek?

Use the white and light-green sections for this soup. The dark-green tops are tougher, but they can be saved for making vegetable or chicken stock.

Why is my potato leek soup gluey?

The potatoes were probably blended too aggressively or for too long. Blend only until smooth, use a potato masher for a chunkier version, and thin the finished soup with warm broth if needed.

Can I use milk instead of heavy cream?

Yes. Whole milk gives a lighter soup, though it will be less rich. Add it at the end and warm the soup gently without boiling. Low-fat milk can also work, but the soup will be thinner.

Can I make this soup ahead of time?

Yes. Prepare it through the blending step, cool and refrigerate it, then reheat gently and add the cream before serving. The soup may thicken in the refrigerator, so loosen it with broth or water.

More from FoodNotes

• roasted butternut squash soup recipe
• roasted garlic mashed potatoes