There’s a reason potato leek soup is a comfort classic: it’s forgiving, creamy without being fussy, and quietly elegant. This version leans on a few dependable techniques—clean, slow-cooked leeks, tender Yukon Golds, and a gentle finish with butter and chives—to give you a soup that feels like home but could just as easily star at a dinner party.

I keep the process honest and straightforward. The key moments are cleaning the leeks, sweating them slowly until soft (not browned), and puréeing to the texture you prefer. The ingredient list is short, and each component has a clear job: body from potatoes, sweetness from leeks, silkiness from half-and-half, and depth from the butter and broth.

Below you’ll find a clear ingredient rundown, the step-by-step method exactly as written, practical swaps for vegetarian and vegan cooks, tools that make the job easier, troubleshooting tips, storage guidance, and answers to the questions I get most often. Roll up your sleeves—this soup is easy to love and easier to make.

Ingredient Rundown

3 pounds leeks, white parts only to make 6 cups diced — the star for flavor: mild oniony sweetness. Trim, slice lengthwise and rinse well to remove grit.
3 medium Yukon gold potatoes, peeled and diced to make 3 cups — provide creaminess and body. Yukon Golds break down nicely without becoming gluey.
4 tablespoons butter, divided — most used for sautéing the leeks; a bit reserved for finishing adds silk and flavor.
2 tablespoons all-purpose flour — gives a light thickening body; toast briefly to remove raw taste.
2 cups chicken broth, or vegetable broth — builds savory depth; use vegetable broth to keep it vegetarian.
2 cups half-and-half, or whole milk — adds creaminess without overpowering; half-and-half gives a richer mouthfeel.
1 bay leaf — gentle background aromatics while the soup simmers; discard before puréeing.
1 teaspoon kosher salt — base seasoning; you may need a touch more after puréeing.
½ teaspoon freshly ground black pepper — finishes with a little bite; add more to taste when serving.
minced fresh chives for serving — fresh, oniony garnish that brightens the finished bowl.

The Method for Potato Leek Soup

Trim and prepare the leeks: cut off the root ends and discard the dark green, tough tops so you are using only the white parts. Slice the white parts lengthwise, rinse thoroughly between layers to remove any grit, then dice to make about 6 cups.
Prepare the potatoes: peel the Yukon golds and cut into 1-inch dice (about 3 cups). Place the diced potatoes in a bowl, cover with cold water, and set aside to prevent browning.
In a large pot over medium heat, melt most of the 4 tablespoons of butter, reserving the remainder for finishing the soup.
Add the diced leeks to the pot and cook, stirring occasionally, until soft and fragrant but not browned, about 15 minutes.
Sprinkle the 2 tablespoons of all-purpose flour over the cooked leeks and stir to coat. Cook and stir for 1 to 2 minutes to remove the raw flour taste.
Drain the potatoes and add them to the pot. Pour in 2 cups chicken (or vegetable) broth, 2 cups half-and-half (or whole milk), and add the bay leaf. Whisk to combine.
Bring the mixture to a gentle boil, then reduce the heat to medium-low and simmer uncovered until the potatoes are easily pierced with a fork, about 15–20 minutes.
Remove the pot from the heat. Discard the bay leaf. Stir in 1 teaspoon kosher salt and 1/2 teaspoon freshly ground black pepper. Let the soup stand about 5 minutes to cool slightly.
Purée the soup until smooth: either use an immersion blender directly in the pot, or transfer the soup in batches to a blender. If using a blender, remove the center piece of the lid to allow steam to escape and cover the lid opening with a towel to prevent splatters. If you prefer a chunkier soup, reserve about 2 cups of the soup before puréeing and add it back after blending.
Return the puréed soup to the pot, stir in the reserved butter, and warm over medium-low heat—do not boil. If the soup is too thick, thin with additional half-and-half or whole milk a little at a time until you reach the desired consistency. Taste and adjust seasoning with more salt if needed.
Serve hot, topped with freshly ground black pepper and minced fresh chives.

What You’ll Love About This Recipe

Simple ingredients, big payoff: each item plays a clear role, so the flavor comes through clean and satisfying.
Flexible richness: choose half-and-half for a richer bowl or whole milk for a lighter finish without losing creaminess.
Texture control: purée smooth for a velvety soup or leave some reserved chunks for a more rustic mouthfeel.
Comfort plus elegance: this soup is cozy enough for weeknight dinners and polished enough to serve guests.
Make-ahead friendly: flavor deepens after a day in the fridge—perfect for prepping in advance.

Vegan & Vegetarian Swaps

Vegetarian: use vegetable broth in place of chicken broth (the recipe already allows this option).
Vegan: substitute olive oil or a vegan buttery spread for the butter, and pick an unsweetened, neutral plant milk (like oat or soy) in place of half-and-half. You can also add a splash of full-fat coconut milk for silkiness, but it will add a hint of coconut flavor.
Thickening without flour: for a gluten-free option, skip the flour and gently mash some potato pieces against the pot to naturally thicken, or use a tablespoon of cornstarch dissolved in cold milk added near the end.

Toolbox for This Recipe

Large, heavy-bottomed pot or Dutch oven — provides even heat for gently sweating leeks and simmering potatoes.
Chef’s knife and cutting board — for trimming and dicing leeks and potatoes accurately.
Immersion blender or countertop blender — immersion blender is fastest and safest for hot soup; countertop blender works but blend in batches and vent the lid.
Measuring cups and spoons — precise amounts help the texture come out right, especially flour and dairy ratios.
Fine-mesh strainer (optional) — for rinsing sliced leeks thoroughly if they’re very sandy.

Slip-Ups to Skip

Don’t skip rinsing the leeks. Leeks trap grit between layers; if you miss this step you’ll find unpleasant sand in the soup.
Don’t brown the leeks. The recipe calls for soft, fragrant leeks. Browning adds a different, more caramelized note and can throw off the delicate balance.
Avoid boiling after adding the reserved butter and dairy. High heat can break the cream (curdle) or make the texture grainy—keep it gentle and warm.
Don’t forget to discard the bay leaf before puréeing. It’s aromatic during cooking but unpleasant if it ends up in the final blend.
Resist over-thickening: it’s easier to thin a too-thick soup than to thicken a watery one. Add extra milk or half-and-half gradually.

Season-by-Season Upgrades

Spring: stir in quick-blanched asparagus tips or fresh peas at the end for color and brightness.
Summer: top bowls with chopped fresh herbs (dill or tarragon) and a squeeze of lemon to brighten the richness.
Autumn: fold in roasted garlic or a drizzle of browned butter with sage for warm, nutty notes.
Winter: serve with a sprinkling of crisp bacon or pancetta for texture (or roasted chestnuts for a festive twist).

Cook’s Notes

Leek cleaning method: slice the white parts lengthwise, then fan the layers under cool running water or soak briefly in a bowl of water to dislodge sand. Lift leeks out rather than pouring the water and grit back over them.
Potatoes: Yukon Golds are recommended for their creamy texture and buttery flavor. Starchy Russets will disintegrate more and may make the soup gluey; waxy red potatoes won’t break down as much.
Flour: cooking the flour with the leeks for 1–2 minutes removes the raw flour taste and helps the soup thicken smoothly. Stir constantly to avoid lumps.
Consistency: to thin the soup, add additional half-and-half or milk a little at a time. If you add too much, adjust by simmering gently until desired thickness returns.
Blending safety: when blending hot liquids in a countertop blender, remove the center cap and drape a towel over the opening to let steam escape. Hold the lid down with the towel—hot soup can expand and splatter if trapped.

Shelf Life & Storage

Refrigerator: cool the soup to room temperature, transfer to an airtight container, and refrigerate for up to 3–4 days. Rewarm gently on the stove over low heat, stirring occasionally.
Freezer: the soup can be frozen, but dairy can separate when thawed. For best results, freeze before adding the reserved butter and avoid half-and-half—use whole milk or a dairy alternative when reheating. Freeze in portions for up to 3 months. Thaw overnight in the fridge before reheating.
Reheating: reheat slowly over low heat and whisk or stir to recombine. If the texture looks grainy after thawing, a quick pass with an immersion blender will help bring it back together.

Bring It Home

Potato Leek Soup is one of those recipes that rewards patience more than fuss. Small attentions—clean leeks, slow sweating, careful seasoning, and gentle warming—turn simple ingredients into something deeply comforting. Keep the method in your back pocket: it’s a template you can adapt with seasonal tweaks, protein add-ins, or garnishes.

Serve it with crusty bread, a green salad, or a simple grilled cheese and you’ve got a meal that’s both unpretentious and memorable. When you try it, take a moment to taste and adjust the seasoning at the end—salt and a bright garnish of chives make all the difference. Enjoy every spoonful.

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Potato Leek Soup

Creamy potato leek soup made with the white parts of leeks, Yukon Gold potatoes, butter, flour, broth and half-and-half, finished with minced fresh chives.

Prep Time20

Cook Time30

Total Time50

Servings: 4 servings

Ingredients

3 poundsleeks white parts only to make 6 cups diced
3 medium Yukon gold potatoes peeled and diced to make 3 cups
4 tablespoonsbutter divided
2 tablespoonsall-purpose flour
2 cupschicken broth or vegetable broth
2 cupshalf-and-half or whole milk
1 bay leaf
1 teaspoonkosher salt
1/2 teaspoonfreshly ground black pepper
minced fresh chives for serving

Instructions

Trim and prepare the leeks: cut off the root ends and discard the dark green, tough tops so you are using only the white parts. Slice the white parts lengthwise, rinse thoroughly between layers to remove any grit, then dice to make about 6 cups.
Prepare the potatoes: peel the Yukon golds and cut into 1-inch dice (about 3 cups). Place the diced potatoes in a bowl, cover with cold water, and set aside to prevent browning.
In a large pot over medium heat, melt most of the 4 tablespoons of butter, reserving the remainder for finishing the soup.
Add the diced leeks to the pot and cook, stirring occasionally, until soft and fragrant but not browned, about 15 minutes.
Sprinkle the 2 tablespoons of all-purpose flour over the cooked leeks and stir to coat. Cook and stir for 1 to 2 minutes to remove the raw flour taste.
Drain the potatoes and add them to the pot. Pour in 2 cups chicken (or vegetable) broth, 2 cups half-and-half (or whole milk), and add the bay leaf. Whisk to combine.
Bring the mixture to a gentle boil, then reduce the heat to medium-low and simmer uncovered until the potatoes are easily pierced with a fork, about 15–20 minutes.
Remove the pot from the heat. Discard the bay leaf. Stir in 1 teaspoon kosher salt and 1/2 teaspoon freshly ground black pepper. Let the soup stand about 5 minutes to cool slightly.
Purée the soup until smooth: either use an immersion blender directly in the pot, or transfer the soup in batches to a blender. If using a blender, remove the center piece of the lid to allow steam to escape and cover the lid opening with a towel to prevent splatters. If you prefer a chunkier soup, reserve about 2 cups of the soup before puréeing and add it back after blending.
Return the puréed soup to the pot, stir in the reserved butter, and warm over medium-low heat—do not boil. If the soup is too thick, thin with additional half-and-half or whole milk a little at a time until you reach the desired consistency. Taste and adjust seasoning with more salt if needed.
Serve hot, topped with freshly ground black pepper and minced fresh chives.

Equipment

Large Pot
Knife
Cutting Board
Measuring cups and spoons
immersion blender or blender

Notes

If you prefer a chunkier soup, reserve about 2 cups before puréeing and stir them back in after blending.