It’s no secret – sweet potato fries are delicious simply plain. A little dash of salt along with that natural earthy sweetness is plenty good. But like many things sweet – they sure do pair well with fiery spices. Here we pair sweet potato fries with a little chili powder and cayenne pepper. That’s balanced with some brown sugar to level out the sweet just right. These are unforgettable fries, whether as a side for BBQ or a burger. The cayenne pepper powder is optional to the recipe, but it does provide a nice medium heat that chili powder alone won’t bring.
🌶️ Quick recipe snapshot
| Flavor profile | Sweet and earthy, with savory chili powder and a cayenne kick at the finish. |
| Primary heat source | A quarter teaspoon of cayenne. The chili powder adds flavor more than heat. |
| Heat level | Mild to medium with the cayenne, mild without it. Cayenne runs 30,000 to 50,000 SHU, and a quarter teaspoon covers two sweet potatoes. |
| Texture | Tender inside, with browned, lightly crisp edges. |
| Best uses | Next to burgers and barbecue, or as a snack with a creamy dip. |
| Customization ideas | Chipotle for smoke, extra cayenne for heat, skins left on to save time. |
| Before you start | Fifteen minutes of prep and 30 to 40 in the oven. Cut the strips to an even half inch so they finish together. |
Flavor notes
Chili powder and cayenne bring different things to these fries. Store-bought chili powder is a seasoning blend, usually cumin, garlic and oregano mixed into a mild chili base, so it adds savory depth more than heat. Cayenne is where the heat comes from, and it runs 30,000 to 50,000 SHU. So a quarter teaspoon across two sweet potatoes is plenty, and you’ll still get mild fries if you leave it out.
Using our homemade chili powder? That blend already has cayenne in it, so the optional quarter teaspoon stacks on top, and you might want to halve the extra the first time you make them.
Sweet potatoes carry several times the sugar of a russet, and the teaspoon of brown sugar adds more. All that sugar colors quickly at 425°F, and the side resting against the hot sheet gets there first. Give them a flip every ten minutes or so. Each turn puts a new side down, so you end up with color all the way around and nothing scorched on one face.
The oil is light, too, at three teaspoons for two whole sweet potatoes, and shaking everything in a bag stretches it. When you seal it and shake, every strip picks up a thin coat of oil and spice. Toss them on the sheet instead and you’ll usually find some bare and others in a puddle of oil.
Adaptation ideas
Most of these changes are about heat or texture.
- Want more heat? Take the cayenne up to half a teaspoon, or add a pinch of red pepper flakes to the bag.
- Prefer smoke? Swap the cayenne for chipotle powder, or use smoked paprika in place of half the chili powder.
- Give them room. Strips that touch tend to steam instead of browning, so if one sheet looks crowded, you’re better off using two.
- Skip the peeler. Scrub the sweet potatoes well and leave the skins on. It saves a step, and the skins brown right along with the rest.
- Cooking for kids? Leave the cayenne out entirely, and with just the chili powder they’re mild enough for most kids.
- Want them crisper? A teaspoon of cornstarch in the bag is a common trick for a crisper outside. Pat the strips dry first so it coats evenly.
Serving ideas
Burgers and barbecue are where these started, but you’ve got plenty of other places to put them.
- Next to pulled pork or brisket. Sweet and a little spicy is a good match for smoked meat.
- With a burger. Beef, turkey or black bean, whichever you’re making.
- In a grain bowl. Over rice or quinoa with black beans, avocado and a squeeze of lime.
- Alongside eggs. If you’ve got leftovers, a few next to fried eggs make an easy breakfast.
- With a creamy dip. Ranch, or plain Greek yogurt with garlic and a pinch of salt, cools off the cayenne.
Storage notes
These are at their best straight off the sheet. Leftovers keep in a covered container in the fridge for three to four days, though they’ll go soft overnight. To reheat, spread them on a sheet pan in a hot oven or give them a few minutes in the air fryer. But the microwave only warms them through and leaves them limp.
Want to prep ahead? Cut the strips a few hours early and keep them in a bowl of cold water in the fridge so they don’t darken. Then dry them well before they go in the bag, so the oil and spice coat them evenly.
Like this recipe? You’ll love these too:
- Chipotle Sweet Potato Fries: Sweet potato fries again, seasoned with chipotle, onion and garlic for smoke instead of cayenne heat.
- Fiery Sriracha Fries: Russet fries baked under a coat of sriracha, for when you want garlic and vinegar along with the heat.
- Air Fryer Paprika Fries: Regular potatoes with paprika, salt and pepper, made in the air fryer.
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Spicy Sweet Potato Fries
Ingredients
- 2 sweet potatoes peeled and sliced into 1/2 inch strips
- 3 teaspoons olive oil
- 1 teaspoon brown sugar
- 1/4 teaspoon salt
- 1/4 teaspoon chili powder
- 1/4 teaspoon cayenne pepper powder optional
Instructions
- Preheat oven to 425 degrees Fahrenheit.
- Line a baking sheet with aluminum foil and lightly coat the foil evenly with 1 teaspoon olive oil.
- In a large Ziploc bag, place the sweet potato strips along with the 2 remaining teaspoons of oil, brown sugar, salt, chili powder, and cayenne pepper powder (optional). Seal and shake the bag vigorously to coat the sweet potatoes evenly with the spices.
- Pour the spiced sweet potato fries onto the foil-lined baking sheet and spread them out evenly.
- Bake the fries for 30 to 40 minutes, until the fries have a crispness to them. Flip the fries 2 to 3 times during the baking process for an even crunch.
