Sweet and spicy sweet potato fries are an irresistible, easy snack. A simple technique ensures they come out crispy on the outside and tender inside—yes, even when baked in the oven.
The trick I rely on for oven-baked sweet potato fries is cornstarch. It prevents sogginess by absorbing surface moisture and forms a thin, crisp coating during baking. Using this method avoids the two extremes of floppy fries or fries that burn before they crisp. The result is perfectly crisp exteriors with soft, flavorful centers—you’ll find it hard to stop at one serving.
Why This Sweet Potato Fry Recipe Works
- Cornstarch creates crispness. It soaks up excess moisture and gelatinizes slightly in the hot oil, forming a crunchy coating during baking.
- Balanced seasoning. The suggested spice mix blends savory and spicy notes that complement the natural sweetness of the potatoes. You can swap in your favorite spices.
- Preheated pan for searing. Heating the baking sheet before adding the fries gives them an immediate sear that helps avoid sogginess and promotes even browning.
Notes on Ingredients
Here are the essentials for the crispiest sweet potato fries. Scroll to the recipe card for a printable ingredient list and exact amounts.
- Sweet potatoes – Leave the skin on or peel them, whichever you prefer. Choose evenly sized tubers for consistent cuts.
- Coconut oil – Melted coconut oil works well, but any neutral oil suited for high heat (or a light olive oil) is fine.
- Cornstarch – Arrowroot can be used as an alternative. For extra crunch, stir 1/2 teaspoon baking powder into the cornstarch.
- Salt and black pepper – Basic seasoning to taste.
- Garlic powder – Gives a gentle garlic flavor without the risk of burned minced garlic in the oven.
- Cinnamon (optional) – Sprinkle after baking for a subtle sweet warmth.
How to Make Sweet Potato Fries
Follow these steps for consistently great fries. Photos below show the main stages. See the recipe card for printable instructions.
- Prepare. Preheat oven to 425°F (218°C) and place the baking sheet inside while it heats. Cut the sweet potatoes into even fries while the oven preheats.
- Season. Toss the fries in cornstarch until coated, then add melted coconut oil and toss again. Mix salt, pepper, and garlic powder and toss the fries until evenly seasoned.
- Bake. Arrange fries in a single layer on the hot baking sheet so they don’t touch. Bake 20–25 minutes, flipping halfway through. If needed, broil 1–2 minutes at the end for extra crispness—watch carefully to avoid burning.
- Rest and serve. Let the fries rest on the sheet 3–5 minutes to firm up, sprinkle optional cinnamon if desired, and serve with your preferred dip.
Tips and Variations
- Choose starchier varieties. Jamaican or Japanese (yellow or white flesh) sweet potatoes are starchier than common orange varieties and tend to crisp up even better.
- Cut uniformly. Keeping fries the same thickness ensures even cooking. If some pieces finish earlier, remove them so the rest can continue without burning.
- Change the seasoning. Add spices like cumin or chili powder before baking; reserve fresh herbs (thyme, rosemary) to sprinkle on after baking so they stay bright.
Serving Suggestions
These fries pair beautifully with ketchup or a garlicky aioli. They also complement burgers—try them with a veggie burger—or turn them into game-day nachos by topping with chili and vegan cheese and returning to the oven until the cheese melts.
How to Store and Reheat Leftovers
- Refrigerator: Store in an airtight container for up to 4 days. Fries are best eaten fresh but keep well for a few days.
- Freezer: Freeze in an airtight container or freezer bag for up to 3 months.
- To reheat: Re-crisp in a 425°F oven or an air fryer. Microwaving is faster but won’t restore crispness.
More French Fry Recipes
- Air Fryer Potato Wedges
- Loaded Nacho Fries
- Air Fryer Shoestring Fries
- Baked Carrot Fries with Harissa Tahini Dip
Enjoy! If you try this recipe, snap a photo and share it on social media. Leave a comment or rating to let others know how it turned out.
Sweet Potato Fries
Servings: 4 servings
Prep Time: 10 mins
Cook Time: 25 mins
Total Time: 35 mins
An easy trick guarantees that these sweet potato fries turn out super crispy, even baked in the oven. You’ll never make them any other way!
Ingredients
- 2 large sweet potatoes, washed, scrubbed, and dried
- 2-3 tablespoons coconut oil, melted (or other oil)
- 1 tablespoon cornstarch or arrowroot powder (optional ½ tsp baking powder for extra crunch)
- 1 teaspoon salt
- 1 teaspoon black pepper
- 1 teaspoon garlic powder
- Optional: cinnamon for sprinkling after baking
Instructions
- Preheat oven to 425°F (218°C). If available, use the convection (fan) setting. Place the baking sheet in the oven while it heats so it’s hot when the fries go on it.
- Cut sweet potatoes into even fries, about 1/4 inch thick by roughly 3 inches long.
- In a large bowl, toss fries with cornstarch until lightly coated. Add melted coconut oil and toss again. Combine salt, pepper, and garlic powder, then add to the fries and toss to coat evenly.
- Carefully remove the hot baking sheet and arrange fries in a single layer without overlapping. Bake 20–25 minutes, flipping once around the 15-minute mark. If needed, broil 1–2 minutes at the end to boost crispiness—watch closely to prevent burning.
- Let fries rest 3–5 minutes on the baking sheet to crisp up further. Sprinkle with cinnamon if desired and serve hot with your favorite dip.
Notes
- Starchier varieties: Jamaican or Japanese sweet potatoes are starchier and crisp more easily. If using them you may not need cornstarch, though the same cooking method still applies.
- Storage – Refrigerator: Keep leftovers in an airtight container up to 4 days.
- Storage – Freezer: Freeze in an airtight container or bag up to 3 months.
- To reheat: Re-crisp in a 425°F oven or an air fryer. Microwaving warms them but will not make them crispy.
Calories: 216kcal
, Carbohydrates: 37g
, Carbohydrates: 37g
Cuisine: American
Course: Side Dish
Author: Jessica Hylton