These oven-baked yam fries are simple to prepare, satisfyingly crispy, and a healthier alternative to deep-fried fries. No more soggy results—this recipe combines a few key techniques and ingredients so the fries turn golden and crisp on the outside while staying tender and creamy inside. They’re finished with a sprinkle of freshly grated Parmesan and an easy truffle lemon aioli.
Sweet Potatoes vs Yams
Although this recipe is labeled “yam fries,” it uses orange-fleshed sweet potatoes. Many people use the terms interchangeably, but true yams and sweet potatoes are different plants with distinct appearances and textures. True yams usually have rough, dark skin and white flesh. Sweet potatoes come in several varieties and colors; the most common is the reddish-skinned, orange-fleshed type used here. Grocery labeling can be inconsistent, so when in doubt look for the orange interior—poke the skin lightly to confirm the flesh is orange.
How to Make Crispy Oven Baked Yam Fries
Oven-baked sweet potato fries can turn mushy without the right approach. Use the techniques below to get a crisp exterior and a creamy interior every time.
Cut evenly. Slice the sweet potatoes into uniform strips so they bake evenly.
Soak the fries. Soak the cut fries in cold water for about an hour (or up to overnight) to remove surface starch. Drain and dry completely—moisture left on the surface prevents crisping.
Dust with corn starch. Working in batches, put the dried fries into a large resealable bag with corn starch, seal, and shake to coat evenly. Shake off excess starch before proceeding. Corn starch forms a light, porous coating that crisps under high heat. Although you remove starch by soaking, sweet potatoes are relatively low in amylose (the component that crisps best), so adding corn starch increases the overall amylose and helps achieve a crunchy finish.
Toss with oil. After the corn starch coating, toss the fries with oil. Oil improves heat transfer so the exterior heats quickly and crisps while the interior cooks more gently, preserving a creamy center.
Season before baking, salt after. Add dry seasonings like garlic powder before baking, but leave the salt until after baking. Salt draws moisture to the surface and can make the fries soggy if added too early.
Space the fries out. Arrange fries in a single layer with space between pieces. Crowding the pan traps steam and prevents crisping. Use multiple baking sheets or bake in batches if needed. If making a large quantity, briefly vent the oven occasionally to release steam.
Flip halfway through. Turn each fry halfway through baking so both sides brown evenly; the metal pan conducts heat more intensely at contact points, so flipping ensures uniform color and texture.
Let them rest. After baking, toss the fries with sea salt and let them rest about five minutes. Cooling slightly helps the coating firm up and improves crunch.
How to Make Truffle Lemon Aioli
For a quick aioli, use a good-quality store-bought mayonnaise as the base. Avoid lighter mayo alternatives—choose a real, full-flavored mayo for the best result.
Whisk together mayonnaise, truffle oil, lemon zest, lemon juice, minced garlic, and salt and pepper (truffle salt if you have it). Adjust to taste and serve immediately or chill for a short time. The truffle and lemon brighten the mayo and pair beautifully with the sweet, crisp fries.
Get the Recipe:
Crispy Oven Baked Yam Fries with Truffle Lemon Aioli
Ingredients
Oven Baked Yam Fries
- 4 Orange-fleshed sweet potatoes, cut into strips
- 4 tbsp Corn starch
- 4-6 tbsp Canola oil (or neutral oil)
- 1/2 tsp Garlic powder
- 1 tsp Sea salt, or truffle salt, to finish
Truffle Lemon Aioli
- 1/2 cup Mayonnaise
- Zest of 1 lemon
- Juice of ½ lemon
- 1 tbsp Truffle oil
- Salt & pepper, to taste
Instructions
Oven Baked Yam Fries
-
Place the sweet potato strips in a bowl of cold water and soak for 1 hour or up to 12 hours.
-
Preheat the oven to 425°F (220°C). Drain and pat the sweet potatoes completely dry with paper towels.
-
Place fries into a resealable bag and add the corn starch. Seal and shake to coat, then remove the fries and dust off any excess. Work in 2–3 batches if needed.
-
Toss the coated fries in a bowl with oil and garlic powder. Spread them in a single layer on parchment-lined baking sheets without overcrowding. Bake for about 30 minutes, flipping each fry halfway through so they brown evenly.
-
Remove from the oven, toss with sea salt, and let the fries rest 5 minutes to firm up before serving.
Truffle Lemon Aioli
-
Combine all aioli ingredients in a bowl and whisk until smooth. Use immediately or refrigerate for up to 2 days.
Related Recipes
Looking for other side dishes? Try these suggestions below.
WARM POTATO SALAD. Roasted potatoes with corn and bacon in a zesty lemon-dill Parmesan dressing.
EASY GARLIC MASHED POTATOES. Creamy, garlicky mashed potatoes with a trick to get great garlic flavor without roasting the garlic.
PROSCIUTTO WRAPPED ASPARAGUS. An effortless way to elevate asparagus into a show-stopping side.
