America's Test Kitchen Sweet Potato Fries Recipe: Double-Crisp Technique for Airy Inside

America's Test Kitchen sweet potato fries recipe delivers restaurant-quality results with a double-crisp exterior and airy interior—no deep fryer required. The secret lies in precise par-cooking and drying techniques that transform starchy sweet potatoes into golden, shatteringly crisp fries every time.

After testing countless methods, we've perfected a foolproof approach that works in both conventional ovens and air fryers, ensuring consistent texture regardless of your equipment.

What sets this method apart is the two-stage cooking process: first par-cooking the fries to develop flavor and remove excess moisture, then crisping them to golden perfection. This technique prevents soggy centers while creating that satisfying crunch.

The seasoning blend—simple yet impactful—enhances the natural sweetness of the sweet potatoes without overpowering their natural flavor profile. Most importantly, this method delivers crispiness that lasts, even after reheating.

By the end, you'll have fries with crispy edges that shatter between your teeth and a tender, fluffy interior that melts slightly with each bite. The aroma alone—warm, caramelized sweet potatoes—will have everyone at the table asking for seconds.

Serve with your favorite dipping sauce or a sprinkle of flaky sea salt for the ultimate snack experience. Ready to master this technique?

The best part? This recipe scales effortlessly—whether you're feeding a crowd or prepping for meal prep. We'll cover every detail, from proper sweet potato selection to the exact cooking times needed for perfect results.

Let's get started on creating fries that taste like they came straight from a high-end restaurant kitchen.

Ingredients for america's test kitchen sweet potato fries

These eleven ingredients transform humble sweet potatoes into crispy, golden fries with a restaurant-worthy crunch and airy interior.

The sweet potatoes are the star—look for starchy varieties like Beauregard, which break down beautifully for that fluffy interior. Trader Joe's and Whole Foods carry excellent options, but any orange-fleshed sweet potato works. Cut them into even 1/4-inch sticks (use a mandoline for precision) and soak in cold water for 30 minutes to remove excess starch—this is non-negotiable for crispiness. The cornstarch isn't just for coating; it's the secret to that shatteringly crisp exterior. Bob's Red Mill brand is my go-to, but any pure cornstarch will work. For the seasoning blend, I always double-check my spices—if they smell stale, toss them. Freshly ground black pepper and smoked paprika make all the difference in that restaurant-quality aroma.

No cornstarch? Arrowroot powder at the same amount works in a pinch, though the texture won't be quite as crisp. Running short on flaky sea salt? Coarse kosher salt sprinkled generously gives similar texture. The rosemary is optional but adds a lovely herbal note—substitute fresh thyme if you prefer. For the par-cooking stage, if you don't have an oven thermometer, invest in one ($10 at Williams Sonoma)—precision matters here. The two-stage cooking process (par-cook then crisp) is what separates these from soggy, sad fries. Trust me on this: skipping either stage means compromising on texture. And yes, you can use an air fryer for both stages—just adjust times by 20% less.

Fresh-cut fries lose moisture fast, so pat them completely dry after the cornstarch coating—this is your crispiness insurance. Store uncooked fries in a single layer on a baking sheet in the fridge for up to 24 hours before cooking (they'll crisp better after drying). Cooked fries reheat beautifully in a 350°F oven for 5-7 minutes—they'll crisp up again like magic. For meal prep, freeze cooked fries in a single layer on a tray, then transfer to a bag. They'll keep for up to 3 months and reheat just as crispy. The secret? Re-crisp in the oven at 400°F for 8-10 minutes—no microwave required.

Step-by-step instructions for america's test kitchen sweet potato fries

Here's the foolproof method that delivers restaurant-quality fries with crispy exteriors and tender centers every time.

Peel the 2 lb sweet potatoes and cut them into even ¼-inch sticks using a mandoline or sharp knife. I like to work in batches—cutting them all at once prevents oxidation and keeps them fresh. Soak the cut fries in cold water for 10 minutes to remove excess starch, then drain and pat completely dry with paper towels. This step is crucial for crispiness—any moisture left on the fries will steam instead of crisp during cooking.

While the fries dry, preheat your oven to 250°F. This low temperature is key for the first cooking phase—it gently cooks the fries without browning, creating a perfect base for the final crisp. Line two baking sheets with parchment paper and lightly grease them with the 0.25 cup olive oil using a paper towel. This prevents sticking and helps create that golden crust later.

Spread the dried fries in a single layer on the prepared baking sheets. They should touch but not overlap—this ensures even cooking. Place them in the preheated oven and bake for 20 minutes, flipping the fries halfway through using a spatula. You're not looking for color yet—just gentle cooking that softens the interior while keeping the exterior dry.

After 20 minutes, remove the fries from the oven and let them cool completely on the baking sheets. This cooling step is essential—it allows the surface to dry out completely, which is the secret to that perfect double-crisp texture. While they cool, combine the 1.5 tsp kosher salt, 0.5 tsp ground black pepper, 0.5 tsp garlic powder, 0.5 tsp smoked paprika, 0.5 tsp onion powder, and 0.25 tsp cayenne pepper in a small bowl.

When the fries are completely cool (they should be room temperature), toss them in a large bowl with the seasoning mixture until evenly coated. Then add the 2 tbsp cornstarch and toss again until every fry is lightly dusted. This cornstarch coating is what creates that signature ultra-crisp exterior. Transfer the seasoned fries to a rimmed baking sheet in a single layer.

Increase your oven temperature to 425°F. Place the fries on the middle rack and bake for 25-30 minutes, flipping them once halfway through. You'll know they're done when they're deep golden brown with crisp edges and just slightly caramelized spots. The interior should still be tender when pierced with a fork—this is the hallmark of the double-crisp technique.

Remove the fries from the oven and immediately transfer them to a serving platter. Add the 2 sprigs fresh rosemary and gently toss to infuse the fries with aromatic freshness. Sprinkle with the 2 tbsp flaky sea salt while they're still warm—this enhances their flavor and adds that gourmet restaurant touch.

Serve immediately while the fries are at their crispest. Each bite should deliver that perfect contrast of crispy exterior and tender interior with layers of savory, slightly sweet, and aromatic flavors. These fries are best enjoyed right away—they soften quickly as they cool.

Health benefits of this dish

Fiber-Rich Powerhouse

Sweet potatoes are packed with dietary fiber—about 7 grams per cup—which supports healthy digestion and keeps you feeling full longer. This makes them an excellent choice for balanced meals, especially when paired with protein like chicken or black beans.

I always include them in my meal prep because the fiber helps stabilize blood sugar levels, making these fries a smart snack option. 💪

Vitamin A Boost

One medium sweet potato provides 400% of your daily vitamin A needs, thanks to its beta-carotene content. This nutrient is essential for maintaining healthy vision, immune function, and glowing skin.

The deep orange color comes from this powerful antioxidant, which also helps protect your cells from damage. I notice my skin looks brighter when I eat sweet potatoes regularly.

Complex Carbs for Energy

Unlike white potatoes, sweet potatoes contain complex carbohydrates that provide sustained energy without the blood sugar spikes. Their glycemic index is lower, making them ideal for active lifestyles or post-workout snacks.

The natural sweetness satisfies cravings while fueling your body with nutrients. I love serving these fries as a side to grilled proteins for a complete, energizing meal.

Rich in Antioxidants

Sweet potatoes are loaded with antioxidants like vitamin C, manganese, and copper, which help combat oxidative stress in your body. These compounds contribute to heart health and may reduce inflammation.

The combination of antioxidants and fiber makes these fries a nutritious upgrade over traditional fried snacks. I always feel more energized after eating them compared to regular potato fries.

Blood Sugar Balance

Despite their sweet flavor, sweet potatoes have a lower glycemic impact than white potatoes when prepared properly. The fiber and resistant starch in these fries help regulate blood sugar levels, making them a better choice for those managing diabetes or insulin resistance.

Pairing them with healthy fats (like avocado dip) further slows digestion and stabilizes glucose levels. 🌟

Skin-Friendly Nutrients

The vitamin C and beta-carotene in sweet potatoes promote collagen production and skin repair, giving you that natural glow. The zinc content also supports skin healing and immune function.

I've noticed my skin stays clearer and more resilient when I include sweet potatoes in my diet regularly. These fries aren't just delicious—they're a beauty boost too!

Frequently asked questions