Crispy on the outside and tender in the center, these oven-baked sweet potato fries give you the best of fries without frying. A simple technique—using a light coating of cornstarch and high heat—creates a golden, crunchy exterior while keeping the insides soft and flavorful. Serve them with a smoky chipotle aioli for a quick, bold side that pairs well with burgers, bowls, or as a snack.
Why This Recipe Works
- No more soggy fries: A light dusting of cornstarch helps draw moisture from the surface, producing consistently crispy fries.
- Keep the peel on: Leaving the skins intact saves time, reduces waste, and adds fiber and nutrients to every bite.
- Year-round and versatile: Sweet potatoes are widely available year-round and adapt well to different spice blends.
- Scalable: The recipe can easily be halved or doubled. Swap or add spices to suit your taste.
- Chipotle aioli is a star: The smoky, creamy dip doubles as a sauce for many dishes—worth making even if you skip the fries.
These fries finish with a crisp, golden exterior and a soft, sweet center—no deep fryer required.
The Secret Ingredient: Cornstarch
Cornstarch is the key to a crunchy exterior. It helps absorb surface moisture and encourages browning, so the fries develop a satisfying texture instead of steaming in the oven. This method works for sweet potatoes and regular potatoes alike. Cornstarch is also a common thickening agent in sauces and a coating for frying, but here we use just a tablespoon to get a reliably crisp crust.
Chipotle Aioli — What Makes It Aioli?
Aioli and mayonnaise are both emulsified sauces, but they differ in flavor and traditional ingredients. Aioli typically highlights garlic and is often made with olive oil, while mayonnaise generally uses a neutral oil like canola. This chipotle aioli includes an egg for stability and olive oil for flavor, plus lime and smoked paprika for brightness. The adobo chipotle chiles bring smokiness and heat—start with a small amount and adjust to taste.
How to Make Oven-Baked Sweet Potato Fries
- Scrub the sweet potatoes well and cut them into sticks of roughly even size so they cook uniformly. They don’t have to be perfect, just similar.
- Whisk olive oil, cornstarch, and kosher salt in a small bowl until smooth.
- Toss the cut sweet potatoes with the cornstarch mixture until well coated, then spread them in a single layer on a rimmed baking sheet. Do not crowd the pan—use two sheets if necessary to avoid steaming.
- Bake at 425°F (220°C) for about 15 minutes, flip the fries, then bake another 10–15 minutes until they’re crisped and golden. Finish with flaky sea salt.
- While the fries roast, make the chipotle aioli so the flavors have time to meld.
This version of oven-baked sweet potato fries was inspired by other creative takes on roasted fries and bold dips.
Cook’s Tips
- Buy local and organic when possible: Fresher tubers will yield better texture and flavor.
- Scrub well: Keep the peel on for flavor and nutrients, just be sure the potatoes are clean.
- Don’t crowd the pan: A single layer ensures roasting rather than steaming, which gives you crispiness.
- Substitute arrowroot: If you prefer, arrowroot powder works in place of cornstarch.
- Line the sheet for easy cleanup: Use parchment paper or a silicone baking mat.
- Storing the aioli: Keep chipotle aioli in a sealed container in the refrigerator for up to two weeks.
Baked Sweet Potato Fries
Extremely crispy oven-baked sweet potato fries served with smoky chipotle aioli.
Yield: Serves 6
Prep time: 12 minutes • Cook time: 25–30 minutes
Ingredients
For the Sweet Potato Fries
- 2 pounds sweet potatoes, washed and unpeeled
- 3 tablespoons olive oil
- 1 tablespoon cornstarch (or arrowroot)
- 2 teaspoons kosher salt
- Freshly ground black pepper, to taste
- Flaky sea salt, for finishing
For the Chipotle Aioli
- 1 whole egg
- 1 tablespoon lime juice
- 1 teaspoon Dijon mustard
- 4 medium garlic cloves, minced
- 1 cup olive oil
- Kosher salt, to taste
- 1 tablespoon smoked paprika
- 3–6 chipotle chiles in adobo, minced (start with less and increase to taste)
Instructions
Sweet Potato Fries
- Preheat the oven to 425°F (220°C).
- Cut the sweet potatoes into evenly sized sticks.
- Whisk the olive oil, cornstarch, and kosher salt together in a small bowl.
- Toss the fries with the oil-cornstarch mixture until evenly coated. Spread them in a single layer on a rimmed baking sheet; use a second sheet if needed. Add freshly ground pepper.
- Bake 15 minutes, flip the fries, then bake another 10–15 minutes until golden and crisp. Remove and finish with flaky sea salt.
Chipotle Aioli
- Place the egg, lime juice, Dijon, and garlic in a blender. Blend on low and slowly drizzle in the olive oil until the mixture emulsifies into a thick aioli.
- Add salt, smoked paprika, and chipotle chiles. Pulse until combined. Adjust chiles, lime, and salt to taste.
Notes
- Sweet potatoes vary in moisture; thinner fries crisp up faster than very thick pieces.
- If you prefer a milder aioli, start with one chipotle and increase slowly.
- Leftover fries can be reheated in a hot oven or air fryer to regain crispness.
More Potato and Roasted Vegetable Ideas
If you enjoy these fries, try variations like smashed potatoes, roasted carrots, roasted beets with tahini, or a lemony roasted potato side. Experiment with spice blends—curry powder, chili-lime, or za’atar all pair nicely with sweet potatoes.
If you make this recipe, leave a comment or share a photo—it’s always fun to see how people customize the flavors. Let’s make waves in the kitchen.