Soups & Stews
This Au Bon Pain mushroom soup recipe delivers the same earthy umami richness and velvety texture you crave from their iconic menu. The secret lies in slow-cooked mushrooms, a rich roux, and a crispy celery crown that adds a satisfying crunch to every spoonful.
I've perfected this version to stay true to the original while making it approachable for home cooks.
The process begins with sautéing mushrooms until deeply browned, which builds that signature depth of flavor. A classic roux made with butter and flour creates the creamy base, while vegetable broth and cream bring it all together. Simmering low and slow ensures the soup develops maximum richness without breaking apart.
What sets this apart is the crispy celery crown—a simple yet essential garnish that transforms ordinary soup into something extraordinary. The celery gets blanched, dried, and baked until golden and crunchy, providing the perfect textural contrast to the silky soup.
Each bite delivers layers of savory, creamy goodness with that satisfying crunch.
Serve with warm bread for dipping or alongside a fresh salad to balance the richness. This recipe makes enough for a crowd, so double it for gatherings—everyone will ask for seconds. The technique is straightforward, but the flavor is restaurant-quality.
Ingredients for au bon pain mushroom soup
Sixteen ingredients transform into restaurant-quality mushroom soup with velvety texture and crispy celery crowns.
| Ingredient | Amount | Notes |
|---|---|---|
| White Button Mushrooms 🍄 | 1 ½ lb | Sliced into 1/4-inch pieces |
| Shiitake Mushrooms 🍄 | ½ lb | Stems removed, caps sliced |
| Yellow Onion 🧅 | 1 whole | Diced into 1/4-inch pieces |
| Garlic Cloves 🧄 | 4 cloves | Minced or finely chopped |
| Unsalted Butter 🧈 | ¾ cup | Cold and cubed for roux |
| All-Purpose Flour 🌾 | ¾ cup | For roux base |
| Vegetable Broth 💧 | 4 cups | Low-sodium preferred |
| Heavy Cream 🥛 | 1 cup | Full-fat for richness |
| Celery Stalks 🥬 | 2 whole | Cut into 1-inch pieces |
| Thyme Leaves 🌿 | 1 tbsp | Fresh or 1 tsp dried |
| Salt 🧂 | 1 ½ tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ½ tsp | Freshly ground preferred |
| Olive Oil 🫒 | 2 tbsp | For celery crown |
| Panko Breadcrumbs 🍞 | ¼ cup | For crispy celery crown |
| Parmesan Cheese 🧀 | ¼ cup | Freshly grated for garnish |
The mushrooms are the heart of this soup—shiitake and white button together deliver that deep umami flavor. Trader Joe's carries pre-sliced shiitake in the refrigerated section, saving you time. For the best texture, slice the mushrooms evenly—thin pieces cook faster and release more flavor. If you can't find shiitake, cremini mushrooms work well too, though they'll be slightly milder. The celery crown requires fresh, crisp stalks—avoid wilted ones, as they won't crisp properly.
No heavy cream? Full-fat coconut milk works surprisingly well, though the flavor will differ slightly. Short on thyme? Fresh rosemary at half the amount adds a nice piney note. The vegetable broth is crucial—low-sodium versions prevent over-salting, but if you must use regular, reduce the added salt. For the celery crown, blanching is non-negotiable—it removes bitterness and ensures crispiness. If you're short on time, baby carrots can substitute for celery in a pinch, though the flavor won't be identical.
This soup tastes even better the next day as flavors meld. Store in an airtight container in the fridge for up to 4 days—the celery crown stays crisp for about 2 days before losing its crunch. For longer storage, freeze the soup without the celery crown (add it fresh when reheating). The celery crown reheats poorly, so always make it fresh. Portion into bowls before freezing for easy reheating—just microwave until hot and top with freshly toasted breadcrumbs and Parmesan.
Why You'll Love This Recipe
- No Chopping Chaos: I swear by this recipe because the onions and mushrooms practically prep themselves—just slice the onions into big chunks and tear the mushrooms (no knife skills required). That shiitake-butter combo alone makes it worth the effort.
- Umami Bomb: The white buttons soak up the garlic like sponges, while the shiitakes add that deep, savory punch. Honestly, the first sip hits like a warm hug—creamy, rich, and somehow better the next day.
- Leftovers Win: This soup tastes like a restaurant dish the first time, but it’s even better cold the third day. I make a double batch every Sunday—half for dinner, half for lazy lunches with toasted baguette scraps.
- Budget Magic: A pound of mushrooms and a single onion stretch into four servings, and butter’s the only splurge. Between us, this is my go-to when grocery money’s tight but I refuse to eat sad salads.
Step-by-step instructions for Au Bon Pain mushroom soup
Master this classic technique for velvety mushroom soup with signature crispy celery crowns.
Prepare the Crispy Celery Crowns
Preheat your oven to 400°F. Cut the 2 whole celery stalks lengthwise into ¼-inch thick strips, leaving the bottom inch intact to form the crown base. In a bowl, toss the celery with 2 tablespoons olive oil, 0.25 cup panko breadcrumbs, 0.5 teaspoon black pepper, and 0.5 teaspoon salt until evenly coated.
Arrange the celery crowns on a parchment-lined baking sheet in a single layer, cut-side down. Bake for 15-20 minutes until the edges are deep golden brown and crispy. Remove from oven and set aside—they'll crisp further as they cool. This step creates the signature crunch that elevates the entire dish.
Build the Mushroom Roux Base
In a large Dutch oven, melt 0.75 cup unsalted butter over medium heat until foaming subsides. Add the 1 whole yellow onion and cook for 5 minutes until softened and translucent. Stir in the 4 cloves garlic cloves and cook for 30 seconds until fragrant—don't let the garlic brown or it'll become bitter.
Add the 1.5 lb white button mushrooms and 0.5 lb shiitake mushrooms (stems removed) to the pot. Cook for 8-10 minutes until the mushrooms release their moisture and begin to brown. Sprinkle in 0.75 cup all-purpose flour and stir vigorously for 2 minutes to create a smooth, golden roux—the foundation of your soup's rich texture.
Develop the Velvety Soup Base
Slowly pour in the 4 cups vegetable broth while whisking continuously to prevent lumps. Add the 1 tablespoon thyme leaves and bring to a simmer. Reduce heat to low and let the soup cook uncovered for 20 minutes, stirring occasionally, until the flavors meld and the liquid reduces slightly. You'll notice the soup develop a deep, earthy aroma—this is where the umami magic happens.
Stir in the 1 cup heavy cream and 1.5 teaspoons salt to balance flavors. Taste and adjust seasoning—you may need additional salt or pepper to complement the earthy mushroom notes. The soup should be thick but still coat the back of a spoon. If it's too thick, whisk in 2-4 tablespoons water to reach your preferred consistency.
Finish and Serve with Crispy Toppings
Ladle the hot soup into bowls, dividing evenly among 6 servings. Top each portion with 2-3 crispy celery crowns and sprinkle generously with 0.25 cup freshly grated parmesan cheese. The contrast between the warm, velvety soup and the crispy celery crowns creates a textural experience that's pure comfort food.
Serve immediately while the celery crowns maintain their crunch. For an extra touch, garnish with additional cracked black pepper. This soup tastes even better the next day—store leftovers in an airtight container in the refrigerator for up to 3 days, reheating gently on the stove with a splash of broth to restore creaminess.
Pro Tips For Making Au Bon Pain Mushroom Soup
- Sear Shiitakes First: The shiitake mushrooms have more flavor to give up, so don’t just toss them in with the buttons. Pat them dry, slice them, and hit them with a hot pan and butter for 3-4 minutes until they’re golden—this builds depth the buttons can’t match on their own.
- Slice Onions Thinly: I used to chop onions roughly, thinking it was faster, but thin slices (almost translucent) cook down smoother and sweeter in the soup. A sharp knife and quick cross-chops work best—no need for fancy juliennes.
- Don’t Skip the Deglaze: After cooking the onions and garlic, those browned bits stuck to the pan are flavor gold. Splash in a little white wine or broth and scrape hard—this lifts the fond and turns a good soup into a great one.
- Use Half Butter, Half Oil: Unsalted butter burns faster than you’d think, especially with mushrooms. Mix it with a neutral oil (like grapeseed) to stabilize the heat and keep the soup from turning into a sad, nutty mess.
Pro cooking tips for perfect results
Mushroom Sauté Mastery
For maximum umami flavor, cook mushrooms in two batches if needed to avoid steaming. Use a 12-inch cast iron skillet or Dutch oven—I love my Lodge Pre-Seasoned—to ensure even browning. Pat mushrooms dry with paper towels first to remove moisture, which helps them develop a better sear.
Cook them until deeply browned (about 8-10 minutes) to build that rich, earthy depth. 🍄
Roux Perfection
The key to a smooth roux is patience and constant stirring. Use a whisk to blend the 0.75 cup flour into the melted butter—this prevents lumps and ensures a silky texture. Cook the roux for exactly 2 minutes over medium heat until it turns a golden, peanut-butter-like consistency.
If it darkens too quickly, reduce heat immediately to avoid burning. A well-made roux is the secret to that velvety finish. 🧈
Simmering Secrets
Simmering at low heat for 20 minutes allows the flavors to meld beautifully. Stir occasionally to prevent the soup from sticking to the bottom of the pot. If the soup reduces too much, add 2-4 tablespoons broth to maintain the perfect consistency.
The longer it simmers, the deeper the flavor—this is where the magic happens. 💫
Celery Crown Crisp
For extra-crispy celery crowns, spread them in a single layer on the baking sheet. Bake at 400°F for 15-20 minutes, flipping halfway through if needed. The secret to crispiness is ensuring they're completely dry before baking—pat them dry with a paper towel.
For added flavor, toss them with a pinch of garlic powder before baking. 🥬
Creamy Finish
When adding the 1 cup heavy cream, stir gently to avoid creating curds. Taste the soup before serving and adjust seasoning—sometimes the cream needs a pinch more salt to balance its richness.
If the soup seems too thick after adding cream, whisk in 1-2 tablespoons broth to reach the ideal spoon-coating consistency. 🥛
Make-Ahead Magic
This soup actually tastes better the next day! Store leftovers in an airtight container in the fridge for up to 4 days. To reheat, warm on the stove over low heat** with a splash of broth to restore creaminess.
The celery crowns stay crisp for about 2 days, so add them fresh when serving. 💡
Nutrition facts
Frequently asked questions
Can I make this mushroom soup vegetarian?
This recipe is already vegetarian-friendly! The rich umami comes from mushrooms and the creamy texture from butter, flour, and heavy cream. For a vegan version, substitute the butter with vegan margarine, use plant-based heavy cream, and ensure your broth is vegetable-based. The crispy celery crowns can remain the same with olive oil instead of butter.
Why does my celery crown turn out soggy?
Soggy celery crowns usually happen from moisture or underbaking. Always pat the celery dry before tossing with breadcrumbs—this is critical for crispiness. Spread them in a single layer on the baking sheet and bake until golden brown (not just pale). If your oven runs hot, check at 12 minutes and reduce heat slightly if needed.
Can I use dried mushrooms instead of fresh?
Fresh mushrooms give the best texture and flavor, but you can substitute with dried mushrooms if needed. Rehydrate 2 tablespoons dried mushrooms in 1 cup hot broth for 20 minutes, then drain and chop. Use this in place of fresh mushrooms, but reduce the broth by 1 cup since rehydrated mushrooms release moisture. The flavor will be similar but less intense.
How can I make this soup dairy-free?
For a dairy-free version, replace the butter with olive oil or vegan butter, and use a 1:1 coconut milk substitution for the heavy cream. The roux can be made with olive oil instead of butter, though the flavor will be slightly different. Ensure your broth is also dairy-free, and use a dairy-free Parmesan alternative for garnishing.
What's the best way to reheat leftovers?
Reheat gently on the stove over low heat with a splash of broth or water to restore creaminess. Never microwave directly from the fridge—this can make the soup watery. For the celery crowns, make fresh when serving since they lose crispness when reheated. The soup tastes even better the next day as flavors meld!