Au Bon Pain 12 Veggie Soup Recipe: Herb-Infused Broth With Crunchy Celery Crown Topping

This Au Bon Pain 12 veggie soup recipe brings the iconic café's signature heartiness to your kitchen—packed with 12 vibrant vegetables, herb-infused broth, and a crispy celery crown topping that adds texture and flair.

The secret lies in slow simmering, which melds flavors into a rich, comforting blend that's both vegetarian-friendly and deeply satisfying. I've perfected this version to deliver that restaurant-quality depth without sacrificing ease, using simple techniques and pantry staples.

The soup's magic comes from balancing earthy root vegetables like carrots and potatoes with bright greens such as kale and spinach, all simmered in a fragrant broth infused with thyme, bay leaves, and garlic.

The celery crown topping—crispy fried celery sticks—adds a satisfying crunch that contrasts beautifully with the creamy, velvety broth. This method ensures every spoonful delivers layers of flavor, from the sweetness of carrots to the herbal notes of the broth.

What sets this recipe apart is its authentic yet approachable technique: no fancy equipment, just a pot and patience. The slow simmer (about 45 minutes) allows the vegetables to soften just enough to release their natural sweetness while maintaining texture.

The result is a restaurant-quality soup that's hearty enough for a cold day but light enough for lunch. Plus, the celery crown topping elevates it from ordinary to extraordinary with minimal effort.

Serve this soup with crusty bread to soak up every last drop of that herb-infused broth, or garnish with a sprinkle of fresh parsley for a pop of color. It reheats beautifully, making it perfect for meal prep or feeding a crowd. Let's get started—your taste buds will thank you.

Ingredients for au bon pain 12 veggie soup

Twelve vibrant vegetables and herb-infused broth create this iconic soup's restaurant-quality depth.

The vegetables are the heart of this soup, so prioritize freshness and even cutting for consistent texture. Sweet potatoes and carrots should be firm with no soft spots, while kale and spinach should be vibrant green—avoid wilted leaves. For the celery crown, select crisp stalks with no brown spots; the Whole Foods Market or local farmers' markets typically carry the freshest produce. Pre-cutting all vegetables into uniform sizes ensures even cooking. The garlic and thyme should be aromatic and free of mold—Penzeys Spices offers high-quality dried herbs if fresh aren't available. For the broth, low-sodium vegetable broth is essential to control seasoning; Pacific Foods or Imagine brands are excellent choices.

No sweet potatoes? Substitute butternut squash for a similar texture and sweetness, though it requires slightly longer cooking. Short on kale? Swiss chard or collard greens work beautifully—just reduce the amount by 20% to account for their denser stems. The celery crown can be made with leeks or fennel instead, though celery provides the classic flavor. For the broth, homemade vegetable stock elevates the dish significantly; simply simmer onion, carrot, celery, and garlic in water for 30 minutes, then strain. If using dried thyme, reduce the amount to one-third of the fresh quantity. The all-purpose flour for the celery crown can be swapped for cornstarch if you prefer a gluten-free option.

This soup reheats beautifully—simply warm on the stove over medium heat, stirring occasionally, until heated through. For optimal freshness, store the vegetable base (without the celery crown) in an airtight container in the refrigerator for up to 5 days or freeze for 3 months. The celery crown should be prepared fresh and fried just before serving to maintain its crisp texture. To streamline meal prep, chop all vegetables and store them separately in the fridge for up to 3 days before assembling the soup. The herb-infused broth can be made a day ahead and stored in the refrigerator, allowing the flavors to meld even further.

Step-by-step instructions for herb-infused vegetable soup with crunchy celery crown

This method delivers a restaurant-quality vegetable soup with a signature crispy celery crown topping.

Heat the extra-virgin olive oil in a large Dutch oven over medium heat until shimmering. Add the 1.5 cups diced yellow onions, 2 cups diced carrots, and 2 cups diced celery stalks (reserving the 12 celery stalks for the crown). Cook for 8-10 minutes, stirring occasionally, until the vegetables soften and release their natural juices.

Here's the thing—don't rush this step. You want the vegetables to develop a deep, caramelized flavor before adding any liquid. The onions should turn translucent and the carrots should begin to soften at the edges. This foundational layer carries the entire soup's depth of flavor, so take your time and let the vegetables develop that sweet, aromatic base.

Add the 6 minced garlic cloves and 0.25 cup chopped fresh thyme to the pot, stirring for 30 seconds until fragrant. This is when the kitchen should fill with that irresistible herbal aroma—your signal that the aromatics are properly infused. Immediately add the 2 whole bay leaves and 2 tsp salt to prevent any bitterness from developing.

Pour in the 6 cups vegetable broth and bring to a gentle simmer over medium-high heat. Add the 2 cups diced russet potatoes and 1.5 cups diced sweet potatoes, stirring to combine. The liquid should just cover the vegetables—this ensures even cooking without making the soup watery.

Once simmering, reduce heat to low-medium and let the soup cook uncovered for 20 minutes. This gentle simmer allows the potatoes to absorb the broth while maintaining their structural integrity. You'll notice the soup gradually reduces as the vegetables release their starches—this is exactly what you want for a rich, flavorful base.

After 20 minutes, add the 2 cups chopped kale leaves and 2 cups chopped spinach leaves, stirring gently to wilt. The greens should cook just until tender—about 3-4 minutes. Immediately remove the 2 bay leaves before they impart bitterness. Taste and adjust seasoning with additional salt or 1 tsp black pepper as needed. The soup should be well-seasoned but not overly salty.

While the soup simmers, prepare the celery crown topping. Cut the reserved 12 celery stalks into 1-inch thick slices, keeping the leaves attached to form "crowns." Pat each slice dry with paper towels—this is crucial for achieving maximum crispiness.

In a shallow bowl, whisk together the 0.5 cup all-purpose flour with 1 tsp salt and 0.5 tsp black pepper. Dredge each celery crown thoroughly in the flour mixture, pressing gently to adhere. Shake off any excess flour—this prevents a gummy coating.

Heat 2 tablespoons extra-virgin olive oil in a large skillet over medium-high heat until shimmering. Fry the celery crowns in batches for 2-3 minutes per side until deep golden brown and crispy. The edges should be slightly charred while the centers remain tender. Transfer to a paper towel-lined plate to drain excess oil and keep warm.

Return the soup to a gentle simmer and let it cook for an additional 10 minutes to allow flavors to meld. The soup should have a velvety texture with well-integrated vegetables. Taste one final time and adjust seasoning if needed—this is especially important after the celery crowns have been added, as they can slightly dilute the broth's intensity.

To serve, ladle the hot soup into bowls and immediately top with the crispy celery crowns. Garnish with 0.25 cup chopped fresh parsley for a pop of color and freshness. The contrast between the warm, velvety soup and the crispy, cool celery crowns creates the perfect textural experience that makes this dish truly special.

Serve immediately while the celery crowns are at their peak crispiness. The soup continues to develop flavor as it sits, so if you need to hold it for more than 15 minutes, keep it covered and reheat gently before serving. This method ensures you capture the essence of Au Bon Pain's signature vegetable soup—rich, hearty, and topped with that signature crunch.

Pro cooking tips for great au bon pain 12 veggie soup

Slow Simmer Secrets

That 45-minute simmer is where the magic happens—don't rush it! The key is maintaining a gentle boil (small bubbles, not rolling) to prevent the vegetables from turning mushy. I use a 6-quart Dutch oven because it gives enough room for the vegetables to develop flavor without overcrowding.

If your pot is too small, cook in batches to avoid steaming instead of simmering. 🌡️

Celery Crown Crispy Tricks

For that signature crispy celery crown, drying the celery slices thoroughly is non-negotiable—wet celery will absorb too much oil and turn soggy. I like to double-dip the slices in flour for extra adhesion, then shake off excess before frying.

Use a thermometer to monitor oil temperature at 350°F—this ensures even cooking without burning. A slotted spoon makes flipping easier without dropping pieces.

Broth Flavor Boosters

Don't skimp on the herb infusion—the combination of thyme, bay leaves, and garlic creates layers of flavor. For extra depth, I add 1 tsp smoked paprika to the broth while simmering.

If you're using store-bought broth, consider adding a 1-inch piece of kombu seaweed (removed before serving) for umami richness. The Pacific Foods low-sodium broth works perfectly for this.

Vegetable Prep Matters

Even cutting is everything—aim for ½-inch chunks for carrots and potatoes to ensure uniform cooking. I use a mandoline slicer for consistent potato cubes, but a sharp chef's knife works too. For the greens, chop kale into ¼-inch ribbons and spinach into ½-inch pieces—this prevents overcooking while maximizing flavor.

The Whole Foods Market pre-cut veggies save time but fresh-cut always tastes better.

Seasoning Like a Pro

Taste as you go! After adding the greens, adjust seasoning with ½ tsp salt increments—this soup should be well-seasoned but not salty. The celery crowns will add subtle saltiness, so balance carefully.

For a umami kick, stir in 1 tsp soy sauce or a pinch of MSG at the end. Freshly ground black pepper adds brightness, so don't skip it. 💡

Make-Ahead Mastery

This soup actually tastes better the next day as flavors meld. Store the vegetable base (without celery crowns) in the fridge for up to 5 days or freeze for 3 months. Reheat gently on the stove—never microwave, as it dulls the flavors.

The celery crowns must be fried fresh for crispiness, but you can prep the flour mixture ahead and store it in an airtight container for 2 days. 📅

Frequently asked questions