Soups & Stews
This sweet potato clam chowder recipe delivers the perfect balance of briny clams, earthy sweet potatoes, and velvety tomato-basil cream—rich yet light, satisfying yet refined. The secret lies in slow-cooking the broth to develop deep, savory notes while keeping the sweet potatoes tender and the clams plump.
I’ve perfected this version over years of testing, ensuring every spoonful delivers that restaurant-quality harmony of textures and flavors.
The foundation starts with a tomato-basil broth that simmers for 20 minutes to meld flavors, while the sweet potatoes roast until caramelized for natural sweetness. Clams steam in white wine and garlic, absorbing the aromatic base before being folded into the creamy chowder at the last moment.
This approach preserves their delicate texture while infusing them with the dish’s rich, herby depth.
What sets this chowder apart is its creamy yet balanced profile—no heaviness from over-thickening, no bitterness from overcooked clams. The sweet potatoes add a subtle sweetness that complements the briny clams, while the tomato-basil broth ties everything together with a bright, fresh finish.
Each bite is a perfect marriage of comfort and sophistication.
Whether you’re serving this as a cozy weeknight dinner or a special occasion dish, it’s designed to impress without requiring advanced techniques. The recipe scales easily, and leftovers reheat beautifully—though you’ll likely eat it all in one sitting. Let’s get cooking!
Ingredients for sweet potato clam chowder
Six ingredients for the chowder base, plus fresh clams and sweet potatoes that transform into restaurant-quality comfort.
| Ingredient | Amount | Notes |
|---|---|---|
| Medium Sweet Potatoes 🍠 | 2 ½ lb | Peeled, cubed into 1-inch pieces |
| Fresh Clams 🦪 | 2 ½ lb | Steamer clams, cleaned and debearded |
| Dry White Wine 🍷 | 1 cup | Sauvignon Blanc or Pinot Grigio |
| Garlic Cloves 🧄 | 6 cloves | Minced, for clam steaming |
| Canned San Marzano Tomatoes 🍅 | 1 can | 28 oz, crushed by hand |
| Fresh Basil Leaves 🌿 | ½ cup | Packed, finely chopped |
| Heavy Cream 🥛 | 1 ½ cups | Full-fat for richness |
| Vegetable Broth 💧 | 3 cups | Low-sodium preferred |
| Unsalted Butter 🧈 | 4 tbsp | Cold, cubed for roux |
| All-Purpose Flour 🌾 | 2 tbsp | For thickening |
| Lemon Juice 🍋 | 2 tbsp | Freshly squeezed |
| Salt 🧂 | 1 ½ tsp | Diamond Crystal kosher |
| Ground Black Pepper 🌶️ | ½ tsp | Freshly cracked |
| Smoked Paprika 🌶️ | ¼ tsp | For depth |
| Olive Oil 🫒 | 2 tbsp | Extra-virgin for roasting |
The sweet potatoes are non-negotiable here—organic sweet potatoes from Whole Foods or your local farmers' market have the best balance of sweetness and texture. Look for ones that are firm and vibrant orange, not shriveled or green-tinged. For the clams, Trader Joe's or local seafood markets carry the freshest steamer clams, but frozen clams in the shell work in a pinch (thaw overnight in the fridge). The white wine should be dry and crisp—Kim Crawford Sauvignon Blanc is my go-to, but any Sauvignon or Pinot Grigio will do. The San Marzano tomatoes are worth the splurge; their sweetness cuts through the richness perfectly.
No white wine? Substitute extra vegetable broth—just add 1/2 cup more. Fresh basil wilt fast, so dried basil at half the amount works if you're in a bind, though it lacks that bright freshness. For the roux, don't rush—cook the butter and flour low and slow to avoid a floury taste. The smoked paprika adds depth without overpowering; if you're out, a pinch of liquid smoke does the trick. For the clams, if you can't find steamer clams, littlenecks or quahogs work too—just adjust cooking time slightly. And if you're feeling fancy, toss in a splash of dry vermouth with the wine for extra complexity.
This chowder tastes even better the next day—4-5 days in the fridge, sealed tightly. For freezing, portion into containers with a bit of headspace (it expands when cold). Reheat gently on the stove, stirring often, and add a splash of water or broth if it gets too thick. The clams should steam just until they open—discard any that don't open within 5 minutes. And if you're prepping ahead, roast the sweet potatoes the day before and store them in the fridge; they'll keep their texture better. The broth can be made 2 days ahead and reheated before adding the clams and cream.
Why You'll Love This Recipe
- One-Pot Magic: The sweet potatoes and clams cook together in the same pot—no chopping boards to clean, no extra pans to wash. I swear by this shortcut: just peel, cube, and toss in. That white wine? It deglazes everything in minutes, pulling all the caramelized garlic and tomato flavors right into the broth.
- Sweet-Savory Balance: The San Marzano tomatoes add bright acidity, while the sweet potatoes bring natural creaminess—no heavy cream needed. The clams steam open just enough to release their briny sweetness, and that garlic? Oh, it’s there, but in the best way, like a warm hug for your taste buds.
- Weeknight or Weekend: Make it for a lazy Tuesday with crusty bread, or bring it to a potluck where everyone’s impressed. Here’s what sold me—it reheats beautifully for lunch the next day, and the flavors actually deepened overnight. (Yes, even on a Tuesday night.)
- Budget-Friendly Luxury: Clams are cheaper than you think when in season, and sweet potatoes last forever in the pantry. I’ll be real: this tastes like a high-end seafood spot, but the ingredient list won’t break the bank. Plus, the leftovers? Still delicious the third day—just add a splash of water and reheat.
Step-by-step instructions for sweet potato clam chowder
Here's how to create a rich, velvety chowder where sweet potatoes and briny clams shine together.
Roast Sweet Potatoes Until Caramelized
Preheat your oven to 400°F and line a baking sheet with parchment paper. Toss the 2.5 lb medium sweet potatoes (peeled and cubed into 1-inch pieces) with 2 tbsp olive oil, 0.5 tsp salt, and 0.25 tsp smoked paprika. Spread them in a single layer—don't crowd the pan. Roast for 25-30 minutes, stirring halfway through, until edges are deep golden brown and slightly crispy.
Here's the thing—roasting develops natural sweetness and creates texture contrast with the creamy broth. You'll know they're perfect when they smell caramelized and a knife slides in easily. Remove them from the oven and set aside in a bowl.
Steam Clams Until Fully Opened
While the sweet potatoes roast, clean and debeard the 2.5 lb fresh clams by scraping off any grit with a stiff brush. In a large pot, combine 3 cups vegetable broth, 1 cup dry white wine, and the 6 cloves minced garlic. Bring to a boil over high heat, then reduce to a simmer.
Add the clams and cover with a tight lid. Steam for 5-7 minutes until all clams open—discard any that remain closed. The broth should smell briny and aromatic. Remove the clams with a slotted spoon and set aside. Strain the broth through a fine-mesh sieve into a clean pot, pressing on the solids to extract all flavor. This liquid is the foundation of your chowder.
Build the Tomato-Basil Base
Return the strained clam broth to the pot and add the 1 can crushed San Marzano tomatoes. Bring to a gentle simmer over medium heat and cook for 10 minutes until slightly thickened. Stir in the 0.5 cup chopped fresh basil leaves and 2 tbsp lemon juice—this adds bright acidity that cuts through the richness.
Here's where the magic happens: the tomatoes and basil infuse the broth with depth. You'll notice the color deepen to a rich amber. Keep it at a gentle simmer—you don't want it to boil vigorously or the basil will turn bitter.
Thicken with Butter and Flour
In a separate saucepan, melt the 4 tbsp cold cubed butter over low heat. Whisk in the 2 tbsp all-purpose flour to form a roux. Cook for 2-3 minutes until it turns a pale golden color—this prevents a raw flour taste. Slowly whisk in 1.5 cups heavy cream to create a smooth, velvety sauce.
Temper the sauce by gradually adding it to the simmering tomato-broth mixture, whisking constantly. The chowder should thicken to a luxurious, spoon-thick consistency. If it's too thick, add 2-3 tbsp reserved clam broth to reach your desired creaminess. Season with 0.5 tsp ground black pepper and adjust salt to taste.
Combine and Finish
Add the roasted sweet potatoes and opened clams to the chowder pot. Gently stir to combine, being careful not to break the clams. Simmer together for 5-7 minutes until everything is heated through and the flavors meld beautifully. Taste and adjust seasoning—you might need a pinch more salt or lemon juice to balance the flavors.
This is the moment that matters: the sweet potatoes should be tender but still hold their shape slightly, and the clams should be warm throughout. Ladle into bowls and serve immediately with crusty bread. Each spoonful should deliver that perfect balance of creamy richness, briny clams, and sweet potato sweetness.
Pro Tips For Making Sweet Potato Clam Chowder
- PARBOIL SWEET POTATOES FIRST: I learned this the hard way—roasting whole sweet potatoes before chopping makes them easier to peel and prevents the chowder from turning gummy. Cut them into 1-inch cubes, boil for 8 minutes, then shock in ice water before peeling. The texture stays creamy without falling apart.
- USE CLAM LIQUOR, NOT WINE: Skip the white wine for clam liquor if you can find it—it’s the real deal. If not, use a mix of dry white wine and a splash of fish stock (about ¼ cup) to mimic the depth. The clams release their own briny sweetness, and the wine gets overpowered otherwise.
- STEAM CLAMS UNTIL FULLY OPEN: Don’t rush the clams—steam them in a colander over simmering water for 6-8 minutes until every single one pops open. Discard any that don’t open (they’re dead and bitter). Once open, remove the clams from their shells immediately—they’ll turn rubbery if left sitting.
- SAUTÉ GARLIC LOW AND SLOW: After deglazing with wine, pull the pan off heat and let the alcohol cook off completely before adding garlic. Then, return to low heat and stir constantly—burnt garlic ruins the whole dish. A minute max, until fragrant but golden, not brown.
Creative variations of this sweet potato clam chowder
Spicy Cajun Twist
Transform this chowder into a bold Cajun-inspired dish by adding 1 tbsp Cajun seasoning (like Tony Chachere's) to the clam broth while steaming. Stir in ½ tsp cayenne pepper with the smoked paprika on the sweet potatoes, and finish with 2 tbsp hot sauce (like Crystal or Tabasco) when serving.
The heat from the cayenne and cayenne-infused clams will wake up your taste buds while keeping the sweetness of the potatoes balanced. 🌶️
Creamy Dairy-Free
For a rich, creamy version without dairy, replace the heavy cream with 1.5 cups full-fat coconut milk (like Thai Kitchen) and use 2 tbsp nutritional yeast in the roux for a cheesy depth. The coconut milk adds natural sweetness that complements the sweet potatoes beautifully.
To keep the chowder velvety, simmer the coconut milk with the broth for 5 extra minutes to reduce slightly before adding the clams and potatoes.
Smoky BBQ Fusion
Infuse the chowder with smoky BBQ flavors by adding ¼ cup BBQ sauce (like Stubb's Original) to the tomato-basil base and swapping the smoked paprika for 1 tsp chipotle powder.
Top each serving with crumbled bacon and a drizzle of honey (just ½ tsp per bowl) to balance the smokiness. The BBQ sauce adds a tangy sweetness that pairs perfectly with the briny clams and caramelized sweet potatoes.
Herb-Infused Variations
Elevate the chowder with fresh herbs by adding 2 tbsp chopped fresh thyme to the clam broth and 1 tbsp chopped fresh parsley at the end. For a Mediterranean twist, swap the basil for ½ cup chopped fresh dill and add 1 tsp dried oregano to the tomato base.
The herbs add layers of complexity without overpowering the dish. Garnish with extra herbs before serving for a pop of color and freshness. 🌿
Spicy Sriracha Swirl
Add a kick of heat by swirling 1 tbsp Sriracha into each bowl before serving. For a smoother heat, blend the Sriracha with 2 tbsp of the chowder and stir it back in.
Pair this with a sprinkle of sesame seeds for a subtle Asian-inspired contrast. The spicy Sriracha cuts through the creaminess, while the sesame seeds add a nutty crunch that balances the dish. 🔥
Seasonal Pumpkin Spice
For a cozy fall version, replace ½ cup of the sweet potatoes with ½ cup roasted pumpkin puree (like Libby's) and add ½ tsp pumpkin pie spice to the tomato base. The pumpkin adds natural sweetness and a velvety texture that pairs beautifully with the clams.
Top with a pinch of cinnamon and a dollop of whipped cream for a dessert-like twist. This variation is perfect for autumn gatherings. 🍂
Nutrition facts
Frequently asked questions
Can I substitute canned clams for fresh?
Yes, but with adjustments! Use 2 (6.5 oz) cans of minced clams (drained) instead of fresh. Add them at the very end to avoid overcooking. For extra flavor, stir 1 tbsp clam juice into the tomato-broth base. The texture will be slightly different but still delicious.
How do I store leftovers without making the chowder watery?
Cool the chowder completely before refrigerating in an airtight container. The cream may separate slightly—just stir gently when reheating. For best texture, reheat on low heat and add 1-2 tbsp reserved clam broth if needed. Never microwave directly from cold. Leftovers keep for 3-4 days in the fridge.
What's the secret to perfectly tender sweet potatoes?
Roast at 400°F until edges are deep golden brown (not mushy!). Cut into 1-inch cubes for even cooking. The smoked paprika in the seasoning helps caramelize them faster. For extra tenderness, parboil for 3 minutes before roasting.
Can I make this chowder dairy-free?
Replace the heavy cream with 1.5 cups full-fat coconut milk and use 2 tbsp nutritional yeast in the roux. Simmer the coconut milk with the broth for 5 extra minutes to thicken naturally. The flavor stays rich and creamy while being completely dairy-free.
Why did my clams turn rubbery?
Overcooking is the most likely cause. Clams should steam for only 5-7 minutes—any longer makes them tough. Also ensure they're fully closed before cooking (discard any open ones). For extra tenderness, add them to the chowder just before serving. The broth should simmer gently, not boil vigorously.