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Baked Sweet Potato Fries with Rosemary & Sea Salt
Holiday-worthy fries that disappear faster than you can say “pass the ketchup.”
Every December, my kitchen turns into a mini-factory of cinnamon, nutmeg, and butter—until the cousins storm in demanding “something salty, Aunt Em!” That’s when I whip out sheet pans of these baked sweet-potato fries. They roast while we string popcorn garlands, and by the time the last bulb is on the tree the fries are gone, leaving only a faint trail of rosemary on the air and a few happy grease spots on the parchment. Over the years they’ve become our unofficial holiday mascot: easier than cookies, healthier than candy, and—because they’re naturally vegan and gluten-free—everyone can grab a handful without a second thought.
What makes this version special is the woodsy perfume of fresh rosemary (no sad, dusty flakes here) and a final snow-fall of flaky sea salt that crackles between your teeth. The sweet potatoes caramelize at the edges, turning candy-like, while staying custard-soft inside. Serve them in a big paper cone for movie night, or pile them high on a platter beside garlicky aioli for the Christmas buffet. Either way, you’ll watch grown adults abandon their fancy roasts for one more fry.
Why This Recipe Works
- Restaurant-level crisp: A light cornstarch coat + screaming-hot oven = golden shell without deep-frying.
- Two-temperature bake: Start at 425 °F for crunch, finish at 375 °F to cook centers through.
- Rosemary-infused oil: Gently warming the olive oil with fresh sprigs perfumes every fry.
- Holiday color palette: Burnt orange fries + pine-green rosemary = edible décor.
- Make-ahead friendly: Slice, soak, and refrigerate up to 24 hours; roast just before guests arrive.
- Natural sweetness balanced: Smoked paprika and salt tame the sugar so they pair with mains, not just dessert.
Ingredients You'll Need
Sweet potatoes – Look for long, evenly shaped tubers labeled “Garnet” or “Jewel.” They’re moister and sweeter than the pale Hannah variety. Avoid any with black spots or sprouts; they’ll taste musty after roasting.
Fresh rosemary – Needles should be perky and pine-scented, never fuzzy or gray. If your market only has the woody stems from last week, sub 2 tsp minced fresh thyme plus ½ tsp ground rosemary.
Extra-virgin olive oil – A mild, fruit-forward oil (think Arbequina) lets the sweet potato shine. Save the peppery Tuscan oil for salad; too assertive here.
Cornstarch – Our secret crisp agent. Arrowroot works too, but avoid flour; it browns too fast and tastes raw.
Flaky sea salt – Maldon or fleur de sel dissolve on the tongue, giving salty pops. Table salt just permeates and can over-season.
Smoked paprika – Adds a whisper of campfire that makes these taste like they came off a wood grill. Regular sweet paprika is fine in a pinch.
How to Make Baked Sweet Potato Fries with Rosemary & Sea Salt for Holiday Snacks
Prep & Soak
Peel sweet potatoes and slice into ¼-inch planks, then into ¼-inch matchsticks. Submerge in a bowl of ice water for 30 minutes. This pulls out excess starch, preventing limp fries. While they soak, position racks in upper-middle and lower-middle of oven; place a heavy rimmed baking sheet on each rack and preheat to 425 °F (220 °C). Hot pans jump-start browning.
Infuse the Oil
In a small skillet combine olive oil and two 4-inch rosemary sprigs. Warm over medium-low until the rosemary sizzles and the oil smells piney, about 4 minutes. Remove from heat; discard the spent sprigs. This scented oil distributes herb flavor evenly without bitter burnt bits.
Dry & Dredge
Drain potatoes and spin in a salad spinner or blot fiercely with kitchen towels until bone-dry. Transfer to a large bowl; dust with cornstarch, smoked paprika, and ½ tsp kosher salt. Toss like you’re flipping a salad—every strip needs a sheer white coat. Excess moisture is the enemy of crunch.
Coat with Aromatics
Remove rosemary leaves from remaining sprigs and mince until you have 1 Tbsp. Drizzle the infused oil over the potatoes; add minced rosemary and cracked black pepper. Toss again until each fry glistens.
Sheet-Pan Strategy
Carefully remove the screaming-hot pans from the oven. Line with parchment (it will smoke a bit—normal). Spread fries in a single layer, no touching; crowded fries steam. If you doubled the batch, use three pans rather than pile up.
The Two-Temp Roast
Slide pans onto separate racks. Bake 15 minutes. Flip with a thin metal spatula, rotate pans top-to-bottom and front-to-back, reduce heat to 375 °F (190 °C), and bake 10–12 minutes more. This drop in temperature cooks the interior without scorching the exterior.
Finishing Touch
Transfer fries to a wire rack set over a sheet pan for 2 minutes; steam escapes so they stay crisp. While still glistening, shower with flaky sea salt so crystals adhere. Serve immediately—sweet potato fries wait for no one.
Expert Tips
Preheat Like a Pro
Give your oven a full 20 minutes to heat. An inexpensive oven thermometer ensures you’re actually at 425 °F; many home ovens run 25 °F cool.
Don’t Skip the Soak
Even 15 minutes cuts surface starch by half, translating to noticeably crisper fries. Busy day? Soak overnight in the fridge.
Uniform Size = Even Cooking
Stack several planks and slice together. If you end up with skinny end pieces, keep them on a separate pan; they’ll finish 5 minutes faster.
Hold the Salt Until the End
Salting before roasting draws out moisture and can create soggy bottoms. A final flourish of flaky salt delivers pops of flavor and texture.
Reuse the Hot Pans
Baking bacon earlier? Keep that rendered fat, replace parchment, and roast your fries in it for a smoky-sweet hybrid that’s downright dangerous.
Batch-Bake for a Crowd
Have three sheet pans cycling: one in the oven, one cooling, one being devoured. Keep finished fries warm on a wire rack in a 200 °F oven up to 30 minutes.
Variations to Try
-
Citrus-Pepper
Swap rosemary for 1 tsp finely grated orange zest and ½ tsp cracked pink peppercorns. Finish with orange-scented sea salt.
-
Maple-Sage
Replace smoked paprika with 1 Tbsp maple sugar and use 1 Tbsp minced fresh sage. Drizzle with an extra 1 tsp maple syrup right out of the oven.
-
Spicy Chipotle
Add ¼ tsp chipotle powder and ¼ tsp ancho chile. Serve with lime-spiked vegan mayo.
-
Everything-Bagel
Skip rosemary; toss hot fries with 1 Tbsp everything-bagel seasoning and a drizzle of garlic-infused oil.
-
Parmesan-Truffle
In the last 2 minutes of roasting, sprinkle ¼ cup finely grated Parm. Finish with a whisper of truffle salt.
Storage Tips
Refrigerating: Sweet-potato fries lose their crunch once chilled. If you must, cool completely, refrigerate in an airtight container up to 3 days, then revive in a 450 °F oven on a pre-heated sheet for 5–6 minutes.
Freezing: Spread cooled fries on a parchment-lined sheet, freeze until solid, then transfer to a zip bag for up to 2 months. Reheat from frozen at 475 °F for 10 minutes, flipping halfway.
Make-Ahead: Slice and soak the potatoes up to 24 hours ahead; store submerged in the fridge. Drain and pat dry just before seasoning. You can also infuse the rosemary oil up to 1 week early; keep refrigerated and warm slightly to liquefy.
Frequently Asked Questions
Baked Sweet Potato Fries with Rosemary & Sea Salt
Ingredients
Instructions
- Prep & soak: Peel and cut sweet potatoes into ¼-inch matchsticks. Soak in ice water 30 minutes. Preheat oven to 425 °F with two sheet pans inside.
- Infuse oil: Warm olive oil with 2 rosemary sprigs over medium-low heat 4 minutes; discard sprigs.
- Season: Drain and thoroughly dry potatoes. Toss with cornstarch, paprika, pepper, and ½ tsp kosher salt. Add infused oil and minced rosemary from remaining sprig; toss to coat.
- Roast: Line hot pans with parchment; spread fries in a single layer. Bake 15 minutes, flip, reduce temperature to 375 °F, and bake 10–12 minutes more.
- Finish: Transfer to a rack, sprinkle with flaky sea salt, and serve hot.
Recipe Notes
For extra crisp, broil on high for the final 60 seconds—watch closely. Fries are best fresh but can be reheated in a 450 °F oven for 5 minutes.
