Air Fryer Sweet Potato Fries Are the Crispy Everyday Snack You’ve Been Craving
Pull up this air fryer sweet potato fries recipe any time you need an easy, nourishing snack.
These air fryer sweet potato fries are everything you want in a side dish — crispy edges, fluffy centers, and a punchy garlic-herb finish that makes them impossible to stop eating. They come together with minimal prep, cook in under 25 minutes, and pair with a quick homemade aioli that takes them from great to genuinely memorable. Serve them alongside a black bean veggie burger, a steak seared in your favorite cast iron skillet, or honestly just on their own.
Why This Air Fryer Sweet Potato Fries Recipe Works
Sweet potato fries are one of those recipes that sounds simple but goes wrong in a few very predictable ways — soggy middles, uneven browning, garlic that burns before the fries finish cooking. This recipe fixes all of that.
The soak matters. Soaking the cut fries in cold water for 30 minutes pulls out excess starch, which is what causes them to steam rather than crisp in the air fryer. Don’t skip it.
Cornstarch is the secret weapon. A light coating of cornstarch before the oil goes on creates a thin, crackly crust that holds up even after the garlic-herb toss at the end.
The garlic goes on last. Garlic burns fast in a hot air fryer. Gently warming it in olive oil with the herbs first, then tossing the fries in that mixture for the final few minutes, gives you a deep, mellow garlic flavor without any bitterness.
These work best in a non-toxic air fryer made without PFAS — basket-style or oven-style both work well here.
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Ingredients for Air Fryer Sweet Potato Fries
For the Aioli:
Kitchen Tools:
- Air fryer
- Large bowl for soaking
- Tea towel for drying
- Small saucepan for the garlic-herb oil
- Small food processor or blender for the aioli
- Knife
- Plastic-free cutting board
How to Make Air Fryer Sweet Potato Fries
STEP 1:
Prep the sweet potatoes. Cut the ends off each peeled sweet potato, then cut them in half crosswise. Halve each piece again lengthwise — first cut a flat side so you have a stable base to work from. You’ll end up with planks about ¼” to ½” thick. Stack the planks and cut them into fry-shaped sticks, roughly 3″ long. Keep in mind: the thicker the stick, the longer it’ll take to cook.
Once cut, soak the fries in cold water for 30 minutes to pull out excess starch. This step is what separates crispy fries from soggy ones.
STEP 2:
Make the garlic-herb oil. While the fries soak, finely chop the garlic. Smash each clove first with the flat side of your knife to remove the skin, sprinkle with a pinch of sea salt to help it pull away from the blade, then chop. Roughly chop the fresh herbs. Combine the garlic and herbs with olive oil or ghee in a small saucepan over medium-low heat. Bring to a gentle simmer until fragrant, then turn off the heat and set aside.
STEP 3:
Drain and dry. After 30 minutes, drain the fries and spread them on a clean tea towel. Dry them as thoroughly as you can — surface moisture is the enemy of crispiness. If your air fryer needs preheating, set it to 400°F now.
Toss the dried fries with cornstarch, coating them evenly. If you have a sieve, use it to sprinkle the cornstarch more evenly across the fries. Then toss in one to two tablespoons of olive oil and sea salt to taste.
STEP 4:
Air fry the sweet potatoes. Arrange the fries in a single layer in the air fryer basket. If they don’t all fit, cook in batches — crowding is what causes steaming rather than crisping. Cook at 400°F for 10 to 12 minutes, until they’re starting to puff and lightly brown. Gently toss or flip, then cook for another 5 minutes. Toss again and cook for a final 5 minutes.
When the fries are almost done and starting to brown, pull them out and toss gently with the garlic-herb oil. Return to the air fryer for 3 to 5 more minutes until browned and done. Taste for seasoning and serve immediately.
Note: Every air fryer runs a little differently. If your fries are cut thinner, start checking at 8 minutes. This recipe also works with a convection oven — just use the same temperature and timing as a guide.
How to Make the Aioli
- Make the aioli. In a small food processor, combine the egg yolk, grated garlic, a couple of pinches of salt, and water — the water helps with emulsification.
- Once combined, slowly drizzle in the olive oil in a thin, steady stream, about one teaspoon at a time, until the sauce is thick and emulsified. With the machine running, drizzle in the lemon juice until fully combined. Stir in cayenne pepper, black pepper, and salt to taste.
- Check the texture: if it’s too thick, add more lemon juice to thin it. If it’s too thin, add a little more olive oil to bring it together. Serve alongside the finished fries.
Substitutions and Variations
- Potato swap: These work with other potato varieties — just adjust your cook time based on the size and thickness of your fries.
- Oil swap: Avocado oil works well in place of olive oil and has a higher smoke point, giving you a little more headroom at 400°F.
- Herb variations: Rosemary and thyme are classic. Smoked paprika, garlic powder, and chili powder make a spicier version. Cinnamon and a touch of brown sugar go in a sweeter direction for a caramelized finish.
- Skip peeling: You don’t have to peel your sweet potatoes. Leaving the skin on adds fiber and a rustic texture — just scrub them well first.
- Aioli shortcut: In a hurry? Stir grated garlic, lemon juice, and a pinch of cayenne into good-quality store-bought mayo for a quick version.
Tips for the Best Air Fryer Sweet Potato Fries
- Soak the fries. Thirty minutes in cold water makes a real difference. Don’t skip it.
- Dry them thoroughly. After soaking, get them as dry as possible before the cornstarch goes on. A damp fry will steam, not crisp.
- Don’t crowd the basket. Single layer if possible, or cook in batches. Crowded fries trap steam and go soft.
- Cut them evenly. Uniform thickness means even cooking. Thicker fries need more time; thinner ones will be done faster.
- Add the garlic last. Garlic burns quickly in a hot air fryer. Toss the fries in the garlic-herb oil for the final 3 to 5 minutes only.
- Serve immediately. These are best straight out of the air fryer. They soften as they sit.
What to Serve with Air Fryer Sweet Potato Fries
These fries are versatile enough to go alongside almost anything. A few favorites:
- Burgers: Serve alongside a black bean veggie burger for a complete plant-based meal.
- Protein: Pair with a steak or chicken seared in cast iron for a simple weeknight dinner.
- On their own: With the aioli for dipping, these are a complete snack all by themselves.
Is It Healthy?
Sweet potatoes are genuinely nutritious — and often underestimated. According to the USDA, one medium sweet potato (about 130 grams) provides around 4 grams of fiber, over 100% of the daily recommended value of vitamin A from beta-carotene, meaningful amounts of vitamin C and potassium, and just under 100 calories before any oil or toppings.¹
Air frying uses a fraction of the oil that deep frying requires, which means the fat content of these fries comes almost entirely from the olive oil and aioli rather than from the cooking method itself. The olive oil brings monounsaturated fats that the American Heart Association associates with supporting healthy cholesterol levels.² The aioli adds richness and fat from the egg yolk and olive oil — not something to worry about in a reasonable serving alongside an otherwise balanced meal.
Air Fryer Sweet Potato Fries Macros (Per Serving)
Estimated per serving without aioli, based on 4 servings from 2 medium sweet potatoes with 1.5 tablespoons olive oil and cornstarch coating.
| Macro | Per serving (estimated depending on serving size) |
| Calories | ~205-400 cal |
| Protein | 2-4g |
| Total fat | 11-22g |
| Carbohydrates | 26-52g |
| Fiber | 3-7g |
| Sugar | 5-10g |
| Sodium | ~210-419mg |
Storing and Reheating
These fries are best eaten immediately — they soften as they sit and don’t reheat as crisply as they come out fresh. That said, if you have leftovers, store them in an airtight container in the fridge for up to two days and reheat in the air fryer at 375°F for 4 to 5 minutes to bring back some of the crispiness. Avoid the microwave if you care about the texture.
Store the aioli separately in a sealed jar in the fridge for up to three days.
Air Fryer Sweet Potato Fries FAQs
Why are my sweet potato fries coming out soggy and not crispy?
Almost always one of three things: you skipped the soak, didn’t dry them thoroughly enough after soaking, or crowded the basket. Crowding traps steam instead of letting hot air circulate. Cook in batches if needed, and make sure the fries are as dry as possible before the cornstarch goes on.
Do I need to peel my sweet potatoes?
No. Leaving the skin on adds fiber and a rustic texture — just scrub them well under running water before cutting. It’s entirely a matter of preference.
What are the best seasonings for sweet potato fries?
Sweet potatoes work with savory and sweet equally well. Smoked paprika, garlic powder, and chili powder for a spicy version. Cinnamon and brown sugar for something caramelized and sweet. Dried thyme and rosemary for something herby and classic. The garlic-herb oil in this recipe is our go-to, but all of these work with the same cornstarch-and-oil base.
Are sweet potato fries healthier than regular fries?
It depends on how you’re defining healthier. Sweet potatoes are higher in vitamin A and fiber; regular potatoes are typically higher in iron, potassium, and vitamin C. The bigger variable is preparation — air-fried at home in a small amount of good-quality olive oil is a different thing entirely from deep-fried fast food fries, regardless of which potato you start with.
Can I make these without an air fryer?
Yes. A convection oven works the same way — use 400°F and the same timing as a guide. Without convection, spread the fries in a single layer on a parchment-lined sheet pan and roast at 425°F, flipping halfway through. They won’t get quite as crispy as in the air fryer, but they’ll still be good.
More Easy Recipes to Try
If you love a good air fryer side dish, these are worth keeping in your back pocket. Our air fryer baked potato delivers a crispy skin and fluffy interior with almost no hands-on time, and our best guacamole recipe makes a natural dipping companion if you want to keep the spread going.
Sources:
- https://fdc.nal.usda.gov/food-details/168483/nutrients
- https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/fats/healthy-cooking-oils
