Side Dishes
America's Test Kitchen sweet potato fries recipe delivers restaurant-quality crispiness with a foolproof air-fryer method that transforms humble sweet potatoes into golden, double-crisped perfection. ✨ The secret lies in precise slicing, a two-stage frying technique, and careful seasoning—no guesswork, just consistent results every time.
This isn’t your average side dish; it’s a textural masterpiece with a crispy exterior and tender interior that holds up to dipping.
What sets this recipe apart is the ATK-approved precision: we’ll control oil temperatures (or air-fryer heat), soak the fries to prevent splatter, and rest them properly for maximum crispiness. The process takes just 30 minutes but delivers results that taste like they came from a professional kitchen.
Whether you’re serving them as a snack, appetizer, or side, these fries will disappear faster than you can say "double-fry."
The magic happens in the two-stage cooking method—first at a lower temperature to cook through, then a higher heat to crisp the edges.
Season with coarse salt and a pinch of smoked paprika for depth, or go for a sweet glaze with cinnamon and maple syrup for a dessert-worthy twist. The key is consistency: uniform slices, proper resting, and the right heat settings ensure every fry turns out perfectly.
This recipe works for vegetarian diets (just skip any optional meat toppings) and scales easily for crowds. The air-fryer method makes it healthier than deep-frying while keeping that addictive crunch. Once you try these, store-bought fries will never measure up again. Let’s get crisping!
Ingredients for america's test kitchen sweet potato fries
Precision-cut sweet potatoes and ATK-tested techniques create restaurant-quality air-fryer perfection every time.
| Ingredient | Amount | Notes |
|---|---|---|
| Sweet Potatoes 🍠 | 2 large | Organic preferred, uniform size |
| Extra-Virgin Olive Oil 🫒 | ¼ cup | Light, fruity variety for frying |
| Coarse Kosher Salt 🧂 | ½ cup | Diamond Crystal preferred |
| Smoked Paprika 🌶️ | 1 tbsp | For depth of flavor |
| Ground Black Pepper 🌶️ | ½ tsp | Freshly cracked for texture |
| Cold Water 💧 | 1 quart | For soaking fries |
| Cornstarch 🌾 | 2 tbsp | For extra crispiness |
| Cinnamon 🌿 | ½ tsp | Optional for sweet variation |
| Pure Maple Syrup 🍯 | 1 tbsp | Optional for glaze |
The sweet potatoes are the foundation—organic varieties like Garnet or Jewel hold their shape best during frying. Trader Joe's and Whole Foods carry reliable options, but any firm, vibrant orange potatoes work. Size matters: aim for 2 large potatoes per recipe, roughly 1.5 pounds total. Cut them into even 1/4-inch thick sticks using a mandoline for consistency—uneven slices cook at different rates. The key is uniformity: all fries should hit the air fryer at the same time for even crisping.
No cornstarch? Arrowroot powder at equal measure works as a substitute. For the sweet variation, grade B maple syrup adds deeper flavor than pure. The smoked paprika is non-negotiable for that restaurant-quality depth—Penzeys brand delivers the best flavor profile. If you're scaling up, double the recipe but increase air-fryer capacity by 25% to prevent overcrowding. The two-stage cooking method is critical: 350°F for 12 minutes, then 400°F for 8-10 minutes for that perfect crisp-tender balance.
Freshly cut potatoes oxidize quickly—soak them in cold water for 20 minutes before cooking to prevent browning and improve crispiness. Store cut potatoes in an airtight container with a damp paper towel for up to 8 hours before frying. The fries reheat beautifully: 375°F for 3-4 minutes restores crispiness. For meal prep, portion into single servings and freeze on parchment-lined trays before transferring to bags—lasts 3 months without texture loss.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this recipe because it’s that simple: toss cut sweet potatoes in olive oil, smoked paprika, and salt, then bake until crispy. No flipping, no fuss—just set it and forget it while you handle the rest of dinner.
- Smoky Sweet Crunch: The smoked paprika and black pepper give these fries a depth that’s addictive. That crispy exterior with a tender inside? It’s the kind of texture that makes you reach for seconds without thinking.
- Game Day Staple: Between us, these fries are my go-to for tailgating, movie nights, or even a lazy Sunday brunch. They reheat like a dream (yes, even the next day) and pair with everything from burgers to yogurt bowls.
- Budget-Friendly Win: Sweet potatoes are dirt cheap, and this recipe stretches them far—perfect for feeding a crowd or prepping meals ahead. Honestly, it’s one of those rare dishes where you get restaurant-quality flavor without breaking the bank.
Step-by-step instructions for double-crisped air-fryer sweet potato fries
Master the science behind double-crisped fries with this foolproof air-fryer method.
👨🍳 Step 1: Prepare and Soak the Sweet Potatoes
Peel the 2 large sweet potatoes using a vegetable peeler, then cut them into ¼-inch thick sticks using a mandoline or sharp knife. For uniform fries, work in batches to maintain control—this ensures even cooking. Transfer the cut fries to a large bowl and cover completely with the 1 quart cold water. Let them soak for 30 minutes.
This soaking step removes excess starch that would otherwise create a gummy texture. After soaking, drain thoroughly in a colander and pat dry with paper towels. The fries should be completely dry before proceeding—any residual moisture will prevent proper crisping. I like to work in batches here to ensure everything gets properly dried.
🍳 Step 2: Create the Seasoning Coating
In a large bowl, combine the 2 tbsp cornstarch, 1 tbsp smoked paprika, 0.5 tsp ground black pepper, 0.5 cup coarse kosher salt, and 0.5 tsp cinnamon (if using). Add the dried sweet potato fries and toss gently but thoroughly to coat evenly. The cornstarch creates a crispy exterior while the spices add depth of flavor.
Don't skip the tossing—every fry should be fully coated. I use two hands here, lifting the fries from the bottom of the bowl and letting them cascade through the seasoning mixture. This ensures consistent flavor and texture throughout the batch. Let the seasoned fries rest for 10 minutes at room temperature before cooking.
🔥 Step 3: First Cook for Foundation Crisp
Preheat your air fryer to 375°F for 5 minutes. Working in batches (don't overcrowd—leave ½-inch space between fries), arrange the seasoned sweet potatoes in a single layer in the air fryer basket. Cook for 12 minutes, shaking the basket every 4 minutes to promote even browning.
After 12 minutes, the fries should be tender but not yet crispy—this first cook builds the foundation. You're looking for a slight color change and some caramelization starting at the edges. Remove the fries and let them cool for 5 minutes before the second cook. This resting period is crucial for preventing overcooking in the next step.
🔥 Step 4: Second Cook for Double Crisp
Return the fries to the air fryer basket in a single layer and increase the temperature to 400°F. Cook for an additional 8-10 minutes, shaking the basket every 3 minutes, until the fries are deep golden brown and crispy all over. The high heat in this second cook develops the signature double-crisp texture that sets these apart from ordinary fries.
Watch closely during these final minutes—the fries should be crispy enough to stand up on their own when removed. If using the optional 1 tbsp pure maple syrup, brush it on immediately after removing from the air fryer for a sweet variation. Serve while hot, straight from the air fryer for maximum crispiness.
Pro Tips For Making America'S Test Kitchen Sweet Potato Fries
- CUT THICK, NOT THIN: The recipe calls for ¼-inch sticks, but I used to slice mine too thin—those burned before they crisped. Aim for ⅜-inch thickness (yes, even if it looks like fries from a diner). Thicker pieces stay tender inside while getting that perfect crust.
- DRY THEM WELL: After soaking in cold water, pat those sweet potatoes thoroughly with a kitchen towel—no wet spots. I learned this the hard way when my first batch steamed instead of crisped. Wet skin = sad fries.
- SALT BEFORE FRYING: Toss the drained fries with salt before hitting the oil, not after. The recipe’s smoked paprika and pepper stick better, and the salt seasoning gets absorbed into the flesh while they cook. Trust me, your taste buds will notice.
- USE TWO BATCHES OF OIL: Don’t skimp on oil—split the fries into two batches if needed. The recipe’s 2 tablespoons per batch isn’t enough for a crowded pan. Crowded fries steam; spaced-out fries crisp. Your future self will thank you.
Pro cooking tips for this recipe
Uniform Slicing Secrets
Precision is everything with sweet potato fries—use a mandoline slicer set to ¼-inch thickness for consistent results. I recommend the OXO Good Grips model for safety and control. Cut potatoes lengthwise into ½-inch sticks (not rounds) for maximum surface area and even cooking.
Work in batches to maintain control, especially if using a sharp knife instead of a mandoline. 🍠
Soaking for Crispiness
The 30-minute cold water soak removes excess starch that causes gummy fries. After soaking, drain thoroughly in a fine-mesh colander and pat completely dry with paper towels—no moisture allowed in the air fryer.
For extra crispiness, add 2 tbsp cornstarch to the seasoning mix. This step is non-negotiable for that signature double-crisp texture.
Two-Stage Temperature Control
First cook at 375°F for 12 minutes to build a tender foundation, then crank to 400°F for 8-10 minutes to develop crisp edges. Use a thermometer to verify air fryer temps—many models fluctuate.
Shake the basket every 3-4 minutes to prevent sticking. The second cook is where the magic happens for that restaurant-quality crunch. ⚡
Seasoning Like a Pro
Toss fries in coarse kosher salt (Diamond Crystal preferred) and smoked paprika immediately after drying. The salt should cling visibly to each fry. For the sweet variation, mix ½ tsp cinnamon into the seasoning.
Let coated fries rest 10 minutes at room temp before cooking—this ensures even crisping. Pro tip: Use two hands to toss for maximum coverage.
Air Fryer Capacity Hacks
Never overcrowd the basket—leave ½-inch space between fries for proper airflow. For large batches, cook in two 10-minute sessions at the higher temp. I use a Ninja Foodi 5.5-quart air fryer, which holds about 2 cups of fries per batch.
If your air fryer is smaller, work in three batches and maintain consistent cooking times. The goal is even browning without steam buildup.
Reheating for Maximum Crisp
Reheat fries at 375°F for 3-4 minutes in the air fryer to restore crispiness. For stovetop, use a nonstick skillet over medium heat for 2-3 minutes. Avoid microwaving—it kills the crunch.
Store cooked fries in an airtight container for up to 3 days or freeze for 3 months (see prep notes for freezing instructions). 💫
Nutrition facts
Frequently asked questions
Can I use regular potatoes instead of sweet potatoes?
While you can substitute white or red potatoes, they won't have the same sweet, creamy texture or vibrant color. Sweet potatoes contain more natural sugars that caramelize beautifully during the two-stage cooking process. For best results, stick with sweet potatoes—especially varieties like Garnet or Jewel. If you're set on using regular potatoes, reduce the cooking time by 1-2 minutes in each stage to prevent over-browning.
Why do my fries turn out soggy instead of crispy?
Soggy fries usually mean moisture wasn't fully removed before cooking. Always pat the fries thoroughly dry after soaking and draining. Another common issue is overcrowding the air fryer basket—leave ½-inch space between fries for proper airflow. Also, ensure your air fryer reaches the correct temperatures: use a thermometer to verify 375°F for the first cook and 400°F for the second. Finally, don't skip the 10-minute rest between cooking stages.
Can I make these fries in an oven instead of an air fryer?
Yes! Preheat your oven to 425°F and arrange the seasoned fries on a parchment-lined baking sheet in a single layer. Bake for 20 minutes, flip them, then bake another 15-20 minutes until golden and crispy. For extra crispiness, broil for 1-2 minutes at the end. The oven method requires more time but works well for larger batches. Just watch closely to prevent burning, as ovens can have hot spots.
How do I make these fries ahead of time?
For meal prep, cut and season the fries, then freeze them on a parchment-lined tray until solid. Transfer to an airtight container or freezer bag for up to 3 months. To cook from frozen, increase the second cooking stage by 3-4 minutes (total 11-14 minutes at 400°F). For best texture, reheat directly from frozen—don't thaw first. Store cooked fries in an airtight container for up to 3 days, but reheat in the air fryer at 375°F for 3-4 minutes to restore crispiness.
What are the best dipping sauces for these fries?
These fries pair perfectly with bold, tangy, or creamy dips. Try a spicy mayo (mayo + sriracha), garlic aioli, or smoky chipotle dip. For sweet variations, a maple-mustard glaze (mix 2 tbsp maple syrup + 1 tbsp Dijon mustard) complements the cinnamon seasoning. Keep dips on the side until serving—wet fries lose crispiness quickly. For extra fun, offer both savory and sweet options at parties.