Sweet potatoes want to go soft in the oven. That’s their nature — they’re dense and sugary, and a timid roast gives you wedges that slouch. Getting them crisp takes a specific set of moves: wedges cut thick enough to hold together, a short soak or a cornstarch dusting to manage the surface, high heat, and — the part everyone skips — actual space between the pieces on the pan so they roast instead of steam. Do those things and you get wedges with caramelized, crisp edges and creamy centers, the kind that hold their shape when you pick them up for dipping.
The chipotle mayo is the other half of this recipe and honestly the part that gets requested. It’s smoky, a little spicy, a little tangy from lime, and it takes about three minutes to stir together. Make the full batch even if you think you won’t use it all: it keeps for a week and improves sandwiches, tacos, grilled corn, and any roasted vegetable it touches.
These wedges are a natural side for a grilled ribeye with garlic butter, and they hold their own as a snack with drinks, too.
Why These Wedges Crisp Up
- Cornstarch is the trick. A light dusting draws surface moisture and forms a thin crust in the hot oven — the same principle behind crispy roasted potatoes of every kind.
- Thick wedges, not fries. Wedges about 3/4 inch at the thick end give you a creamy interior to contrast with the crisp outside. Thin fries of sweet potato mostly just dry out or burn at the tips.
- Space on the pan is mandatory. Crowded wedges steam each other. Two pans, one layer, no touching — that’s the rule.
- Heat at the end. They roast at 425°F, and a final 2 minutes under the broiler (watched carefully) deepens the caramelized edges.
Ingredients
For the wedges
- 2 large sweet potatoes, about 2 pounds total, scrubbed (peeling optional)
- 2 tablespoons cornstarch
- 2 tablespoons olive oil or avocado oil
- 1 teaspoon smoked paprika
- 1 teaspoon garlic powder
- 1/2 teaspoon ground cumin
- 1/2 teaspoon kosher salt, plus flaky salt for finishing
- 1/4 teaspoon black pepper
- Pinch of cayenne (optional)
- Chopped cilantro or parsley, for serving (optional)
For the chipotle mayo
- 1/2 cup mayonnaise
- 1 to 2 chipotle peppers in adobo, finely minced, plus 2 teaspoons of the adobo sauce
- 1 tablespoon lime juice
- 1 small clove garlic, grated
- 1/4 teaspoon smoked paprika
- Pinch of salt
- 1 teaspoon honey (optional, to balance the heat)
Instructions
- Cut the wedges. Halve each sweet potato lengthwise, then cut each half into 4 long wedges, so you get 8 wedges per potato. Try to keep them similar in thickness so they finish together. Leave the skin on — it helps the wedges hold their shape and crisps nicely.
- Soak (worth it if you have time). Put the wedges in a big bowl of cold water for 30 minutes. This pulls out surface starch and pays off in crispness. Drain and pat the wedges very dry with towels. If you’re short on time, skip the soak but dry them thoroughly — surface water is the main cause of limp wedges — and lean on the cornstarch in the next step.
- Heat the oven. Preheat to 425°F (220°C). Put a large rimmed baking sheet (or two) in the oven while it heats — starting the wedges on a hot pan gives the bottoms a head start on crisping.
- Season. Put the dry wedges in a large bowl and sprinkle the cornstarch over them; toss until every wedge has a thin, even dusting and no white clumps remain. Drizzle with the oil and toss again, then add the smoked paprika, garlic powder, cumin, salt, pepper, and cayenne, and toss one more time so the seasoning coats everything.
- Roast. Carefully spread the wedges on the hot pan(s) in a single layer, cut sides down where you can, with space between them. Roast for 20 minutes, then flip each wedge and roast 12 to 15 minutes more, until the edges are deep golden, caramelized in spots, and the centers are tender when pierced. For extra edge color, broil for 1 to 2 final minutes and watch them the whole time — sweet potato sugars go from caramelized to burnt fast.
- Make the chipotle mayo. While the wedges roast, stir together the mayonnaise, minced chipotle and adobo sauce, lime juice, garlic, smoked paprika, salt, and honey if using. Taste and adjust: more adobo sauce for smoke and heat, more lime for brightness. Resting it for even 15 minutes lets the flavors blend.
- Serve. Pile the wedges on a platter, finish with flaky salt and herbs if you like, and serve the chipotle mayo in a small bowl for dipping. Serve them hot — they lose their crisp edge as they sit.
Tips for Success
- Dry is everything. After the soak (or straight from cutting), the wedges should feel dry to the touch before the cornstarch goes on. Wet wedges plus cornstarch equals gummy paste instead of a crust.
- Don’t crowd, ever. If your wedges don’t fit in one layer with gaps, use two pans and rotate them halfway through. Steamed sweet potato wedges cannot be rescued.
- Cut evenly. Wedges that vary by half an inch finish minutes apart. A few seconds of care at the cutting board beats picking burnt pieces off the tray.
- Season after the oil. Spices tossed onto dry wedges bounce off; oil first gives them something to cling to. The cornstarch still goes on before the oil so it sticks to the potato itself.
- Reheat in the oven, not the microwave. Five to eight minutes at 425°F brings back most of the crisp. The microwave makes them soft, every time.
Variations
- Loaded wedges. Treat them like nachos: scatter with black beans, shredded cheese, and pickled jalapeños for the last 5 minutes of roasting, then finish with the chipotle mayo and cilantro.
- Different dip energy. Swap the chipotle mayo for a maple-mustard dip (equal parts Dijon and maple syrup with a spoonful of mayo) for a sweeter, kid-friendlier plate.
- Curry-spiced. Replace the paprika and cumin with 2 teaspoons of curry powder and serve with a yogurt-lime dip.
- Parmesan finish. Toss the hot wedges with 1/4 cup of finely grated Parmesan right off the pan; it melts into the crust in the residual heat.
Storage and Make-Ahead
These are best straight from the oven, but leftovers keep in the fridge for up to 4 days and reheat respectably at 425°F for 5 to 8 minutes. I often cut and soak the wedges a day ahead, keep them in their soaking water in the fridge, then dry, season, and roast at dinnertime — that split makes this a genuinely fast weeknight side.
The chipotle mayo keeps for up to a week in the fridge and freezes poorly, so make what you’ll use in that window. If a bowl of it survives the wedges (unlikely), spread it on a brisket sandwich — it was practically made for the leftovers of an oven BBQ beef brisket.
Frequently Asked Questions
Why aren’t my wedges crispy?
Almost always one of three causes: the wedges were wet, the pan was crowded, or the oven wasn’t hot enough. Dry them well, give them space, and confirm your oven actually reaches 425°F — many run cool.
Do I have to peel the sweet potatoes?
No. The skin helps the wedges keep their shape, adds texture, and holds nutrients. Just scrub them well. Peel if you prefer a more uniform look.
Can I make these in an air fryer?
Yes — 400°F for 14 to 18 minutes, shaking the basket twice, in a single uncrowded layer. Work in batches rather than filling the basket; the same no-crowding rule applies.
How spicy is the chipotle mayo?
With one chipotle pepper it’s a gentle, smoky warmth; with two it’s a real kick. Start with one, taste, and mince in the second if you want it. Removing the seeds from the peppers tames them noticeably.
Recipe Card
- Prep Time: 15 minutes, plus 30 minutes soaking (optional)
- Cook Time: 35 minutes
- Total Time: About 50 minutes (1 hour 20 with soaking)
- Servings: 4 as a side
Ingredients: Sweet potatoes, cornstarch, olive oil, smoked paprika, garlic powder, cumin, salt, pepper, mayonnaise, chipotle peppers in adobo, lime juice, garlic, honey (optional).
Instructions summary: Cut sweet potatoes into 8 wedges each; soak 30 minutes if you have time, then dry thoroughly. Toss with cornstarch, oil, and spices. Roast in a single layer on a hot pan at 425°F for about 35 minutes, flipping once, until crisp-edged and tender. Stir together the chipotle mayo ingredients, rest, and serve with the hot wedges.
