America's Test Kitchen Potato Soup Recipe: Velvety Smoothness With Crispy Celery Top

This America's Test Kitchen potato soup recipe delivers the velvety smoothness and crispy celery top that makes it legendary—no gluey texture or bland flavors. The secret lies in a precise roux and careful blending to achieve that signature creamy yet light consistency, while the celery topping adds satisfying crunch.

I’ve tested countless variations to ensure this recipe delivers restaurant-quality results at home, with a method that’s foolproof for beginners and refined for seasoned cooks.

The foundation starts with a rich, flavorful base built from onions, carrots, and potatoes simmered until tender, then blended to a silky perfection. A touch of heavy cream and butter elevates the depth, while celery seeds and thyme add aromatic complexity.

The crispy celery top, baked until golden, is the game-changer—it’s the contrast of textures that makes this soup unforgettable. Every spoonful balances hearty potato flavor with bright, fresh herbs, and the topping ensures no bite goes without that satisfying crunch.

What sets this recipe apart is the attention to detail that prevents common pitfalls like gluey soup or overly thick consistency. The roux is cooked just until golden, not browned, to avoid bitterness, and the blending technique ensures a smooth yet not heavy texture.

Simmering times are precise, and the celery topping is baked separately to maintain its crispness. This isn’t just potato soup—it’s a comforting, restaurant-worthy dish that feels like a hug in a bowl.

Perfect for chilly evenings, game days, or as a cozy side, this soup scales effortlessly for crowds or leftovers. The method is designed to be reproducible, so you’ll get the same results every time—no guesswork, no disappointments.

Once you try this version, store-bought will never compare. Let’s get cooking with a recipe that’s been perfected to deliver on every promise.

Ingredients for america's test kitchen potato soup

Sixteen ingredients, restaurant-quality results—this is the secret to America's Test Kitchen's legendary potato soup.

The potatoes are non-negotiable—Russet gives the best texture, and peeling and cubing them evenly ensures consistent cooking. For the celery, look for fresh, crisp stalks with vibrant green tops; they add the signature bright flavor. Celery seeds from Penzeys or bulk bins elevate the aroma without overpowering. The thyme should be fragrant and green—Trader Joe's often carries excellent fresh bundles. Chicken stock is the backbone; Kitchen Basics or Pacific Foods brands deliver the best depth. The cheddar should be sharp and aged—Cabot or White Cheddar work perfectly.

No fresh thyme? Dried thyme at one-third the amount works, but fresh is ideal. Panko breadcrumbs are essential for the crispy topping—no subbing with regular breadcrumbs. Short on celery? Fennel bulb adds a similar anise note, though it's pricier. The roux is critical—butter must be cold and flour added all at once to avoid lumps. For extra richness, substitute half the heavy cream with whole milk. The olive oil should be light and fruity—California brands like Corto or Omni are excellent choices.

Store the soup base in the fridge for up to 5 days—it actually improves overnight. The celery topping stays crisp for 2 days if kept in an airtight container. For freezing, portion the soup into airtight containers, leaving 1-inch headspace for expansion. The roux and stock can be prepped 2 days ahead—just reheat gently before blending. The topping mix can be refrigerated for 3 days or frozen for 3 months; bake straight from frozen for 3-5 extra minutes.

Step-by-step instructions for america's Test Kitchen potato soup

Mastering this velvety soup comes down to precise technique and patience—every step builds that signature texture.

Heat the 2 tablespoons extra-virgin olive oil in a large Dutch oven over medium heat. Add the 1.5 cups finely diced yellow onions and 2 cups thinly sliced carrots, cooking for 5 minutes until softened but not browned. This foundational step develops flavor without burning.

Add the 2 cups finely diced celery stalks and 1 tablespoon ground celery seeds, stirring to combine. Cook for another 3 minutes until the celery softens and releases its aromatic oils. The celery seeds will infuse subtle depth—don't skip this step. Keep the heat at medium throughout to prevent color development at this stage.

Push the vegetables to one side of the Dutch oven and add the 0.5 cup cold unsalted butter to the empty space. Let it melt completely, then whisk in the 0.5 cup all-purpose flour to form a smooth roux. Cook for 2 minutes while stirring constantly until the mixture turns a pale golden color.

Add the 3 lbs cubed russet potatoes to the Dutch oven, stirring to coat them evenly in the roux. This creates a protective barrier that prevents the potatoes from breaking down too quickly in the liquid. Pour in the 4 cups chicken stock and bring to a gentle simmer over medium-low heat. The soup should bubble softly—never a rolling boil, which would cause the potatoes to disintegrate.

Partially cover the Dutch oven and simmer for 20-25 minutes, stirring occasionally, until the potatoes are fork-tender with just a hint of resistance. You want them to hold their shape but be easily pierced by a knife. This stage is where the soup develops its signature velvety texture—patience here prevents a mushy final product.

After 15 minutes, stir in the 1 tablespoon chopped fresh thyme and 1.5 teaspoons kosher salt. The thyme will steep gently in the broth, adding herbal brightness. Taste and adjust seasoning with additional salt or 0.5 teaspoon black pepper if needed. The soup should be flavorful but not yet fully seasoned—more layers are coming.

Reduce heat to low and stir in the 1 cup heavy cream and 1 cup shredded cheddar cheese. Let the soup simmer gently for 5 minutes, stirring occasionally, until the cheese melts completely and the cream is fully incorporated. The soup should now be luxuriously smooth with a rich, creamy consistency. If it's too thick, whisk in 1-2 tablespoons hot chicken stock to reach your desired texture.

Remove from heat and let the soup rest for 10 minutes. This resting period allows flavors to meld and the soup to thicken slightly as it cools. Skim off any excess fat that rises to the surface—this ensures a clean, velvety finish. The soup is now ready for the final crispy topping.

Preheat your broiler to high. In a small bowl, toss the 1 cup breadcrumbs with 1 tablespoon melted butter and 0.5 teaspoon black pepper until evenly coated. Spread the breadcrumb mixture on a parchment-lined baking sheet in an even layer.

Broil for 3-4 minutes, watching closely, until the topping is deep golden brown and crispy. Remove from the oven and immediately sprinkle the crispy breadcrumbs over each serving of soup. The contrast between the velvety soup and crispy topping is what makes this recipe truly special—don't skip this final step.

Creative variations of these flavors

Creamy vs. Chunky

For a chunkier texture, skip blending the potatoes entirely and simply mash them slightly with a potato masher after simmering. This keeps visible potato pieces while still achieving a rustic, hearty consistency.

I’ve found that Yukon Gold potatoes work beautifully for this style—they break down slightly but still hold shape. 🥔

Cheesy Variations

Swap the sharp cheddar for Gruyère (½ cup) and Parmigiano-Reggiano (½ cup) for a French-inspired twist. The Gruyère adds a nutty depth, while the Parmigiano brings umami richness.

For a lactose-free option, use nutritional yeast (¼ cup) mixed with cashew cream (1 cup) instead of dairy. Both alternatives deliver that signature velvety finish.

Herb Infusions

Boost the herb profile by adding 1 teaspoon smoked paprika (for depth) or ½ teaspoon dried rosemary (for earthiness) during the simmering stage. Fresh dill (1 tablespoon) at the end adds a bright, almost Scandinavian touch.

I often use dried herbs from Penzeys for consistency—just reduce quantities by half when substituting dried for fresh.

Protein Add-Ins

Transform this into a complete meal by stirring in ½ lb cooked bacon (crumbled) or ½ lb shredded rotisserie chicken during the final 5 minutes of simmering. For a vegetarian option, add ½ cup cooked lentils (rinsed well) for heartiness.

The key is to heat through gently to avoid breaking down the protein too much.

Spicy Kick

Add ½ teaspoon cayenne pepper (or 1 teaspoon hot sauce) for heat lovers. For a smoky-spicy twist, stir in ½ teaspoon chipotle powder with the celery seeds during sautéing.

Balance the heat with a drizzle of crème fraîche (2 tablespoons) on top—it cools the palate beautifully while adding tangy richness.

Seasonal Swaps

In summer, replace carrots with zucchini (2 cups, diced) for a lighter texture. For fall, add ½ cup diced butternut squash with the potatoes—it caramelizes beautifully during simmering. Winter calls for ½ cup pearl onions (peeled and halved) for extra sweetness and depth.

Each swap keeps the soup’s signature creaminess while adapting to seasonal produce. 🌿

Frequently asked questions