Crispy Air Fryer Sweet Potato Fries

These air fryer sweet potato fries are crisp on the outside, fluffy in the middle and full of naturally sweet, savoury flavour. The secret is simple: cut the sweet potatoes evenly, parboil them briefly, coat them with a light cornflour mixture and cook them in a hot air fryer until golden.

This recipe takes a little longer than simply throwing raw sweet potato into the air fryer, but the extra steps make a noticeable difference. Instead of soft, limp fries, you get well-seasoned air fryer sweet potato fries with a satisfying bite and a tender centre.

They make a delicious side dish, lunch or snack and are a lighter alternative to deep-fried restaurant-style sweet potato fries. Serve them hot with your favourite mains, burgers, grilled meat, chicken, mushrooms, dips or a fresh salad.

How to make Crispy Sweet Potato Fries in the Air Fryer

📖 Step by Step Recipe

This post was updated on 15/03/2025 by placing the recipe card higher up on the page for a better user experience.

Continue reading for ingredient details, substitutions, cooking tips and serving ideas for these crispy air fryer sweet potato fries.

Ingredients

These air-fried sweet potato fries use simple everyday ingredients. Each one has a purpose, from building flavour to helping the fries crisp in the air fryer.

Sweet Potatoes

Sweet potatoes are the main ingredient. Once cooked, they become tender, earthy and naturally sweet. One large sweet potato is enough for two portions and fits neatly into one drawer of a dual air fryer when cut into fries.

You can peel the sweet potato or leave the skin on. If leaving the skin on, scrub it thoroughly before slicing. Depending on the size of your air fryer basket, you can use one large sweet potato, two medium sweet potatoes or three smaller ones. The most important thing is to cut the fries evenly so they cook at the same rate.

If you want to use regular potatoes instead, follow a standard air fryer chips method and cut the potatoes thinner to create classic fries.

Cornflour

Cornflour is the key ingredient for extra crispiness. When mixed with cold water, it forms a thin slurry that coats the sweet potato fries. As the fries cook in the air fryer, this coating helps create a crisp, golden outside.

If you do not have cornflour, cornstarch or plain flour can be used instead. However, cornflour gives the best crisp result for this recipe.

Seasoning Ideas

Salt and black pepper are the easiest seasonings for sweet potato fries. They balance the natural sweetness and keep the flavour simple. You can adjust the amount to suit your taste.

For more flavour, try garlic powder, cayenne pepper or a ready-made spice blend. Good options include:

• Cajun seasoning
• Piri piri seasoning
• Chicken seasoning
• Curry powder
• BBQ seasoning

Olive Oil

Olive oil helps the fries cook evenly, prevents them from drying out and encourages a golden finish. You can drizzle it over the coated fries or use spray oil for a lighter coating.

If you do not have olive oil, use another suitable cooking oil such as canola oil, sunflower oil or avocado oil.

Fresh Herbs (optional)

Fresh parsley is optional, but it adds colour and freshness to the finished fries. It also makes them look more appealing when served.

You can swap parsley for coriander, chives or another fresh herb, or simply leave it out.

Equipment

You only need a few kitchen basics to make crispy sweet potato fries in the air fryer.

A sharp knife makes it easier to cut even fries. The air fryer gives the sweet potatoes their crisp edges without deep frying. A colander is useful for draining the parboiled fries, and a large mixing bowl makes it easy to coat everything evenly in the cornflour slurry.

Instructions

Follow these step-by-step instructions for crisp, golden air fryer sweet potato fries with a fluffy centre.

Preparing Sweet Potatoes

Wash and peel the sweet potato, or leave the skin on if preferred. Cut it into evenly sized fries. Keeping the pieces similar in thickness helps them cook evenly and makes it easier to get a crisp finish.

Parboil Fries

Parboiling is an important step. It partially cooks the inside of the sweet potato fries before they go into the air fryer. This helps the centre become soft and fluffy while the outside has time to crisp.

Bring a pan of water to the boil, add the cut sweet potatoes and cook for 3 to 4 minutes. Drain well and let the steam escape before coating.

Making the Cornflour Slurry

Mix the cornflour and cold water in a small bowl until smooth. Add salt, pepper and any extra seasoning at this stage.

This mixture helps the seasoning cling to the fries and supports the crisp texture during air frying.

Coating the Fries

Place the parboiled sweet potato fries in a large bowl. Pour over the cornflour slurry and toss gently until the fries are evenly coated. Try not to break the fries as they will be slightly softened from parboiling.

Cooking Time

Spray or drizzle the coated fries with olive oil. Place them in the air fryer basket in one layer, leaving space between the fries where possible. Overcrowding the basket can make the fries steam instead of crisp.

Cook at 200°C / 400°F for 10 minutes, then shake the basket or turn the fries with tongs. Continue cooking for another 10 to 15 minutes, or until golden and crisp.

Checking for Doneness

The fries are ready when they are golden, crisp at the edges and soft inside. Cooking time can vary depending on your air fryer and the thickness of your fries, so add a few extra minutes if needed.

Finish with fresh parsley and extra seasoning to taste. Serve immediately while the fries are hot and crisp.

Serving Suggestions

Air fryer sweet potato fries are versatile and pair well with many meals. Serve them with lamb chops, garlic mushrooms and pea puree for a hearty plate, or enjoy them with chicken and coleslaw for an easy dinner.

They also work well with burgers, steak, grilled meats, roast chicken, homemade sauces or your favourite dips. Their sweet and savoury flavour makes them a great alternative to regular fries.

Storage Advice

Allow leftover cooked sweet potato fries to cool to room temperature, then transfer them to an airtight container. Store in the fridge for up to 4 days.

To reheat, place them back in the air fryer or oven until hot and crisp again. Avoid microwaving if you want to keep the best texture.

More Air Fryer Potato Recipes

If you enjoyed these air fryer sweet potato fries, try more potato recipes made in the air fryer. They are simple, practical and ideal for easy meals and side dishes.