Soups & Stews
This au bon pain potato leek soup recipe delivers that signature velvety texture and comforting aroma that makes it a restaurant favorite. The secret lies in slow-simmered leeks and creamy potatoes, balanced by fresh herbs that elevate every spoonful. I've perfected this recipe to capture that iconic restaurant quality at home, where the flavors develop deeply through gentle cooking and proper blending techniques.
What sets this soup apart is the technique: leeks are sautéed until perfectly tender, potatoes simmer until fork-tender, and the soup is blended just until smooth—not pureed into oblivion. This creates that signature silky texture while preserving the natural flavors.
The result is a soup that's rich yet light, creamy without being heavy, and packed with the comforting taste of home.
The finished soup should be golden, fragrant, and velvety with just a hint of herby brightness from thyme and parsley. Each spoonful delivers perfectly balanced flavors—sweet leeks, earthy potatoes, and a touch of creaminess that makes it irresistibly comforting.
The slow simmering process develops complex flavors that you simply can't achieve with quick cooking methods.
Serve it hot with crusty bread or croutons for that classic Au Bon Pain presentation. This recipe makes enough for a family of four, with leftovers that reheat beautifully. The secret to restaurant-quality results lies in patience and attention to detail—every step matters for that perfect velvety finish.
Ingredients for au bon pain potato leek soup
Thirteen ingredients, expertly balanced for that iconic Au Bon Pain velvety texture and herby finish.
| Ingredient | Amount | Notes |
|---|---|---|
| Yellow Onions 🧅 | 2 whole | Thinly sliced, white and light green parts only |
| Leeks 🧅 | 3 whole | Large, cleaned thoroughly, white and light green parts |
| Russet Potatoes 🥔 | 2 lb | Peeled, cut into 1-inch cubes |
| Fresh Thyme 🌿 | ¼ cup | Leaves only, stems removed |
| Fresh Parsley 🌿 | ¼ cup | Flat-leaf preferred, finely chopped |
| Heavy Cream 🥛 | ½ cup | Full-fat for optimal creaminess |
| Chicken Stock 💧 | 4 cups | Low-sodium, homemade preferred |
| Extra-Virgin Olive Oil 🫒 | ¼ cup | For sautéing leeks and onions |
| Garlic Cloves 🧄 | 4 cloves | Minced, not powdered |
| Salt 🧂 | 1 ½ tsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | ½ tsp | Freshly cracked preferred |
| Bay Leaves 🌿 | 2 whole | For depth of flavor |
| Butter 🧈 | 2 tbsp | Unsalted, for finishing |
The leeks and onions form the flavor foundation—look for fresh, crisp leeks with minimal yellowing and onions with firm, white layers. Whole Foods or local farmers' markets carry the best quality, but any well-stocked grocery store will have suitable options. For the potatoes, Russets or Yukon Golds work best—their waxy texture holds up beautifully during blending. Fresh herbs are non-negotiable here; thyme and parsley should be vibrant and aromatic, not wilted. If using dried herbs, reduce to one-third the amount, but fresh delivers that signature restaurant-quality brightness. The chicken stock should be rich but not overly salty—homemade stock with roasted chicken bones yields the deepest flavor, but quality low-sodium store-bought works in a pinch.
No fresh thyme? Dried thyme at one-third the amount works, though it lacks the bright herbal notes. Substituting vegetable stock for chicken stock is acceptable, though the flavor will be subtly different. For a dairy-free option, use coconut cream instead of heavy cream, though the texture will be slightly lighter. The butter at the end is crucial—it adds a luxurious finish that elevates the soup from homemade to restaurant-quality. If you're avoiding dairy entirely, a neutral oil like avocado oil can be used, though the flavor profile shifts slightly. The bay leaves may seem minor, but they contribute an earthy depth that's essential to the soup's complexity—don't skip them.
This soup develops even better the next day, so make a double batch if you have leftovers. Store in airtight containers in the fridge for up to 5 days, or freeze for 3 months in portion-sized containers. When reheating, add a splash of water or stock to restore creaminess—it's normal for the soup to thicken slightly upon cooling. For serving, garnish with extra herbs and a drizzle of cream just before eating to maintain that restaurant-fresh presentation. The soup's velvety texture comes from proper blending—don't over-blend, or you'll lose that signature silky mouthfeel that makes this recipe legendary.
Why You'll Love This Recipe
- I swear by this trick: slice the onions and leeks together, then dump them straight into the pot. No measuring cups, no stress—just rough chop and go. That’s how I get it on the table in 25 minutes, even when I’m still in my pajamas.
- Chop Once, Done: I swear by this trick: slice the onions and leeks together, then dump them straight into the pot. No measuring cups, no stress—just rough chop and go. That’s how I get it on the table in 25 minutes, even when I’m still in my pajamas.
- Leek Love Bomb: The secret’s in those pale green layers—sweet, almost floral when they soften just right. Toss in a handful of fresh thyme at the end, and suddenly you’ve got this bright, herby depth that makes store-bought soup taste like a sad memory.
- Lunchbox Hero: Between us, this soup is my go-to for packing leftovers. It reheats beautifully, and the potatoes hold their shape (no sad mush here). My kids actually eat it cold the next day—with crusty bread, of course—because it’s that good.
Step-by-step instructions for Au Bon Pain potato leek soup
A rich, velvety soup with layers of savory depth and bright herb notes—this method delivers restaurant-quality texture.
Sauté Leeks and Onions Until Translucent
Heat the 0.25 cup extra-virgin olive oil in a large Dutch oven over medium-low heat. Add the 2 whole yellow onions and 3 whole leeks, sliced thinly, spreading them evenly in the pan. Cook for 10-12 minutes, stirring occasionally, until completely softened and translucent with just a hint of golden color.
This slow cooking process draws out moisture and develops sweetness in the leeks. If they brown too quickly, reduce the heat slightly—you want them to caramelize gently, not burn. I like to press down occasionally with a wooden spoon to help them release their natural juices.
Add Potatoes, Garlic, and Seasonings
Increase heat to medium and add the 2 lb russet potatoes, cut into 1-inch cubes, along with the 4 minced garlic cloves, 1.5 tsp salt, 0.5 tsp black pepper, and 2 whole bay leaves. Stir to coat everything evenly with the leek mixture, ensuring the potatoes are well-distributed.
Pour in the 4 cups chicken stock, bringing the mixture to a gentle simmer. The potatoes should be mostly submerged—if not, add a splash of water. Cover the pot and let it cook for 15-18 minutes until the potatoes are fork-tender but not falling apart. This ensures they'll break down smoothly during blending.
Blend Until Silky Smooth
Remove the 2 whole bay leaves and transfer half of the soup mixture to an immersion blender. Blend until completely smooth, then return it to the pot. Repeat with the remaining mixture, ensuring no potato lumps remain. The soup should have a velvety, almost custard-like consistency at this stage.
If you prefer a chunkier texture, use a regular blender (in batches) and leave some potato pieces intact. For the classic Au Bon Pain style, I recommend blending completely—this creates that signature silky mouthfeel. If the soup is too thick after blending, whisk in 1-2 tablespoons of the chicken stock to reach your desired consistency.
Finish with Cream and Herbs
Reduce heat to low and stir in the 0.5 cup heavy cream and 2 tbsp butter. Let the soup simmer gently for 3-4 minutes until heated through. The cream should warm slightly but not curdle—if it starts to separate, remove from heat immediately and whisk vigorously to re-emulsify.
Stir in the 0.25 cup fresh thyme leaves and 0.25 cup fresh parsley, reserving a few sprigs for garnish. Taste and adjust seasoning with additional salt or black pepper as needed. The soup should be rich but balanced, with bright herb notes cutting through the creaminess.
Serve with Herbs and Crusty Bread
Ladle the soup into bowls and garnish with the reserved thyme and parsley sprigs. For extra depth, I like to top each serving with a swirl of cream and a sprinkle of freshly cracked black pepper. Serve immediately with crusty bread to soak up every last drop of that velvety goodness.
This soup tastes best fresh, but you can reheat leftovers gently on the stove, stirring in a splash of chicken stock to restore creaminess. The flavors actually improve overnight as the herbs infuse further—just avoid boiling when reheating to prevent curdling.
Pro Tips For Making Au Bon Pain Potato Leek Soup
- CHAR THE LEEKS FIRST: Leeks have a stubborn layer of dirt and grit near the root end—don’t just rinse them. Cut off the dark green tops, split them lengthwise, and run cold water through the hollows while scrubbing with your fingers. I learned this the hard way after tasting a gritty bite in my first batch.
- PEEL POTATOES AFTER COOKING: Russets bruise easily when peeled raw, and you’ll end up with uneven chunks. Toss whole, scrubbed potatoes into boiling water for 2 minutes first, then peel them while still hot—the skins slide off like magic. (Yes, even if you’re impatient like me.)
- SALT THE POTATOES EARLY: Add a generous pinch of salt to the cooking water when you start the potatoes—this keeps them from turning gluey later. I used to wait until the end, and the soup always ended up gummy. Trust me, the starch needs that salt from the start.
- STRAIN AND REHEAT THE BROTH: After simmering, strain out the solids and reheat the broth separately before blending. This gives you a silky texture without lumps, and you can adjust the seasoning before adding the cream or cheese. (Your future self will thank you.)
Storing and reheating this recipe
Refrigerator Storage
Store your leftover potato leek soup in an airtight glass container (I love Pyrex with snap-on lids) and refrigerate for up to 5 days. The flavors deepen overnight as the herbs infuse further—this is actually when the soup tastes best!
Let it cool completely before storing to prevent condensation, which can dilute the creaminess. 🥣
Freezer Preservation
For long-term storage, freeze the soup in quart-sized freezer bags (leave 1-inch headspace for expansion) or airtight containers. It keeps well for 3 months—just thaw overnight in the fridge before reheating.
I recommend portioning into single-serving containers so you can grab exactly what you need without thawing the whole batch.
Stovetop Reheating
My preferred method is gentle stovetop reheating to preserve that velvety texture. Heat the soup over medium-low heat, stirring frequently, until warmed through (10-12 minutes).
If it thickens too much, whisk in 1-2 tablespoons of chicken stock or water to restore creaminess. Never boil—this can cause the cream to separate or curdle. 🔥
Microwave Method
For quick reheating, transfer soup to a microwave-safe bowl and heat on 50% power in 1-minute intervals, stirring between each. Cover loosely with a microwave-safe lid or damp paper towel to prevent drying. Add a splash of stock if needed—microwaving can make soups lose moisture faster than stovetop methods.
Garnish Refresh
Always finish with fresh garnishes after reheating. A sprinkle of fresh parsley and a swirl of heavy cream (or dairy-free alternative) restores that restaurant-quality presentation. I also like adding a pinch of black pepper and a few thyme leaves just before serving to brighten the flavors.
The garnish makes all the difference! ✨
Texture Restoration
If your reheated soup loses its velvety texture, don't worry—it's easily fixed! Blend briefly with an immersion blender to restore smoothness, or whisk vigorously to re-emulsify any separated cream.
A splash of warm stock works wonders for rebuilding body. The key is patience—rushing reheating is what causes texture breakdown in the first place.
Nutrition facts
Frequently asked questions
Can I make this soup without heavy cream?
For a lighter version, substitute the 0.5 cup heavy cream with 0.5 cup whole milk or 0.5 cup coconut cream (for dairy-free). The texture will be slightly less rich, but the flavor remains balanced. If using coconut cream, choose full-fat for best results and stir in at the very end to prevent curdling.
Why does my soup turn out too thick after blending?
This happens when potatoes release too much starch during cooking. Fix it by whisking in 1-2 tablespoons of warm chicken stock until you reach a smooth, velvety consistency. For future batches, reduce simmering time by 2-3 minutes to prevent over-cooking the potatoes. The key is blending while potatoes are still slightly firm.
What's the best way to clean leeks for this recipe?
Cut off the dark green tops and roots, then slice lengthwise to reveal the white core. Rinse thoroughly under cold water while holding open with your fingers to remove trapped dirt. For extra clean leeks, soak in cold water for 5 minutes before slicing. Always use the white and light green parts only—they're the sweetest and most flavorful.
How can I make this soup spicier? Add 1/2 teaspoon smoked paprika or 1/4 teaspoon cayenne pepper when sautéing the leeks and onions. For a smoky kick, stir in 1/2 teaspoon chipotle powder with the cream.
Can I use frozen leeks instead of fresh?
Frozen leeks work in a pinch, but fresh delivers better texture and flavor. If using frozen, thaw and drain well first, then pat completely dry with a paper towel. For the best results, add them to the pot 5 minutes earlier than fresh leeks since they'll cook faster. The flavor won't be quite as bright, but the soup will still be delicious.