There’s a moment, right around the 25-minute mark in the oven, when the kitchen starts to smell like a French countryside cottage: rosemary hitting warm olive oil, a hint of caramelized sweet potato sugar, and that unmistakable promise of something crisp. I first served these wedges at a Friends-giving potluck in 2016 when my oven was the size of a shoebox and my rosemary plant was the only thing thriving on a fire-escape garden. They disappeared faster than the turkey. Since then, these purple-tinged beauties have become my weeknight security blanket, my holiday show-stopper, and the side dish I email to frantic friends who text, “I need something EASY but impressive.” They’re week-night-easy, meal-prep-friendly, and somehow taste fried even though the only oil you’ll use is a light kiss of extra-virgin. If you can cut a potato and toss it in a bowl, you’re 35 minutes away from the crispiest, fluffiest, most herb-perfumed side dish your sheet pan has ever met.

Why This Recipe Works

Double oven heat: A 425 °F blast plus pre-heated sheet pan equals bakery-level crunch without deep-frying.
Cornstarch light-coat: Just a teaspoon per potato absorbs surface moisture and yields glass-shard crisp edges.
Fresh rosemary timing: Adding halfway through preserves piney perfume so it doesn’t incinerate.
Uniform wedge geometry: One quick roll-cut gives flat faces for max caramelization and fork-tender centers.
Neutral oil option: Swap in avocado oil for high-heat holidays when oven real-estate is crowded.
Vegan, gluten-free, dairy-free: Crowd-pleasing across every dietary table without tasting “healthy.”
One bowl, one pan: Because nobody volunteers to wash dishes on a Tuesday night.

Ingredients You'll Need

Quality ingredients speak loudly when the recipe list is short, so treat this as your grocery-store treasure map.

Sweet Potatoes Look for firm, unblemished medium sweet potatoes about 6–7 oz each. Orange-fleshed Garnets are classic, but purple Okinawan or cream-colored Hannahs roast just as well. Avoid mega-monster tubers; they hold more moisture and steam rather than roast.
Fresh Rosemary Needles should be springy, deep green, and highly aromatic. Woody stems are fine—strip the leaves by running two fingers backwards down the sprig. Dried rosemary is a different herb entirely; skip it here.
Extra-Virgin Olive Oil A moderately fruity, everyday oil works. Save the grassy finishing oil for salad; you want something that can take 425 °F without turning acrid.
Cornstarch The secret-crisp agent. Potato starch or arrowroot are fine subs, but skip flour—it browns too fast.
Kosher Salt & Fresh Black Pepper Diamond Crystal dissolves faster; if using Morton's, cut volume by 25 %. Crack pepper just before tossing for volatile-citrus top notes.
Optional Finishes A whisper of smoked paprika, orange zest, or flaky sea salt can catapult the wedges into dinner-party territory.

How to Make Crispy Baked Sweet Potato Wedges with Rosemary for Sides

Preheat & Preheat Your Pan

Place a rimmed sheet pan (half-sheet size, 13 × 18-inch) on the middle oven rack and heat to 425 °F (220 °C). A screaming-hot surface jump-starts caramelization and prevents the dreaded “soggy bottom” syndrome. Let it heat at least 10 minutes once the oven beeper goes off; cast-iron retains heat even better if you own a griddle that fits.

Wash, Peel (or Don’t)

Scrub potatoes under cool water; peel only if you mind a little extra fiber. I keep the skin on—vitamins live there and it turns crackly. Pat absolutely dry with a lint-free tea towel; surface water is the enemy of crunch.

Roll-Cut Perfect Wedges

Halve each potato lengthwise, lay cut-side down for stability, then slice each half into 3 or 4 long wedges about ¾-inch thick at the outside edge. Uniform thickness = uniform cooking. Transfer to a large mixing bowl.

The Cornstarch Slurry

In a small ramekin, whisk 1 teaspoon cornstarch with 1 tablespoon water until milky. Drizzle over wedges. This micro-coat swallows surface moisture and later dehydrates into a shatteringly crisp shell.

Season & Toss

Add olive oil, salt, and a few cracks of black pepper to the bowl. Using clean hands, toss until every wedge looks glossy. Think sunscreen application—no white (cornstarch) streaks left behind.

Sheet Pan Ballet

Working quickly, slide the rack out halfway, scatter wedges onto the hot pan cut-side down, then immediately shove the rack back in. Hear that faint sizzle? That’s the sound of future crisp edges.

First Roast (Undisturbed)

Bake 15 minutes without touching. Moving them releases steam and starches that glue the potatoes to the metal. Trust the process—Instagram can wait.

Add Rosemary & Flip

Remove pan, scatter fresh rosemary leaves over potatoes, flip each wedge with tongs so the caramelized side faces up. Return to oven 12–15 minutes more, until edges blister and centers yield easily to a fork.

Optional Finishing Char

For steak-house crust, broil 1–2 minutes watching like a hawk. Rotate pan halfway for even char. Remove when wisps of rosemary smoke curl up like incense.

Rest & Serve

Let wedges cool 3 minutes on the pan; steam trapped inside finishes cooking the fluffy interior. Sprinkle with flaky salt, serve hot. They stay crisp up to 30 minutes on a wire rack—perfect for holiday buffet pacing.

Expert Tips

Dry Like You Mean It After washing, roll potatoes in a kitchen towel and press firmly. Any lingering water will steam the wedges and sabotage crunch.

Don’t Crowd the Pan Overlapping = steamed sweet potatoes. Use two pans if doubling; air gaps are your crisp insurance.

Cornstarch Ratio 1 teaspoon per large potato is plenty; excess creates a powdery mouthfeel. Measure first few times, then eyeball.

Rosemary Timing Adding too early in a 425 °F oven fries the herb into bitter speckles; halfway preserves flavor and color.

Reheat in Air-Fryer 400 °F for 3–4 minutes restores day-two crunch better than an oven and faster than a microwave.

Cast-Iron Upgrade Swap the sheet pan for a preheated cast-iron griddle and shave 3–4 minutes off cook time due to heat retention.

Sweet Potato Size Golf-ball-sized sweets = more peel-to-flesh ratio; jumbo ones can be cottony inside. Aim for 6–8 oz each.

Flavor Layering A whisper of orange zest tossed in at the end brightens the sweet earthiness without turning them “desserty.”

Variations to Try

Smoky Paprika + Lime Zest Swap half the rosemary for ½ tsp smoked paprika and finish with lime zest for Spanish street-cart vibes.
Parmesan-Herb Crust In the last 5 minutes, dust with ¼ cup finely grated Parm; cheese melts into lacy crisps around the edges.
Maple-Sriracha Glaze Whisk 1 Tbsp maple syrup with 1 tsp Sriracha and brush on during the last 3 minutes for sticky heat.
Everything-Bagel Seasoning Replace rosemary with 1 Tbsp Everything seasoning + sesame oil for brunch appeal.
Curry Leaf + Mustard Seed Sizzle 1 tsp black mustard seeds and curry leaves in hot oil, toss with roasted wedges for Indian fusion.
Low-FODMAP Sub rosemary with 1 tsp fresh thyme and use garlic-infused oil to keep flavor while avoiding fructans.

Storage Tips

Refrigerator

Cool wedges completely, then refrigerate in an airtight container up to 4 days. Line container with paper towel to trap condensation and preserve texture.

Freezer

Freeze in a single layer on a tray until solid, then transfer to zip-top bag for up to 2 months. Reheat directly from frozen 12 min at 425 °F on a sheet pan—no thaw required.

Make-Ahead Party Hack

Par-roast wedges 10 minutes, cool, cover, and refrigerate up to 24 hours. Finish roasting 15–18 minutes just before guests arrive; rosemary added fresh in round-two.

Frequently Asked Questions

In U.S. grocery stores the orange tubers labeled “yams” are actually soft sweet potatoes. True yams are starchier and drier; they’ll work but need an extra drizzle of oil and 3–5 more minutes in the oven.

Most likely the sheet pan wasn’t preheated, potatoes were wet, or they were overcrowded. Any one of those will steam instead of roast. Follow the preheat step religiously and dry like you’re blow-drying a poodle.

Absolutely. Preheat air-fryer to 400 °F. Cook wedges in a single layer 10 minutes, shake, add rosemary, then 6–8 minutes more. Work in small batches for best airflow.

Yes, if you want both sides caramelized. A quick tong flip is faster than wrestling a spatula under fragile potatoes later.

Keep the cornstarch ratio 1 tsp per potato and use multiple sheet pans on separate racks. Rotate pans top-to-bottom halfway through roasting for even browning.

Cut and soak wedges in cold salted water up to 4 hours to remove excess starch. Drain, spin in salad spinner, then proceed with the recipe; soaking actually helps crispiness.

Crispy Baked Sweet Potato Wedges with Rosemary for Sides

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Pin Recipe

Crispy Baked Sweet Potato Wedges with Rosemary for Sides

(4.9 from 127 reviews)

Prep

10 min

Cook

30 min

Servings

Ingredients

2 medium sweet potatoes (about 6–7 oz each)
1 tsp cornstarch
1 Tbsp water
2 Tbsp extra-virgin olive oil
1 tsp kosher salt
½ tsp freshly ground black pepper
1 heaping Tbsp fresh rosemary leaves (from 2 sprigs)
Optional: flaky sea salt for finishing

Instructions

Preheat: Place sheet pan on middle rack and heat oven to 425 °F (220 °C).
Prep potatoes: Wash, dry, and cut into ¾-inch wedges.
Cornstarch slurry: Whisk cornstarch with 1 Tbsp water; drizzle over potatoes.
Season: Add oil, salt, pepper; toss to coat.
Roast part 1: Spread wedges cut-side down on hot pan; bake 15 minutes.
Add rosemary: Scatter rosemary over potatoes, flip, bake 12–15 minutes more until browned.
Finish & serve: Cool 3 minutes, sprinkle with flaky salt, serve hot.

Recipe Notes

For maximum crispness, avoid parchment or silicone mats; direct metal contact is key. Reheat leftovers in an air-fryer at 400 °F for 3–4 minutes.

Nutrition (per serving)

162

Calories

Protein

24g

Carbs

Fat

Crispy Baked Sweet Potato Wedges with Rosemary for Sides

Why This Recipe Works

Ingredients You'll Need