Air Fryer Sweet Potato Fries with Marshmallow Dip

Air Fryer Sweet Potato Fries with Marshmallow Dip

I rely on the visual cue more than the clock with sweet potato fries. Air fryers vary, and sweet potatoes naturally crisp less than russets, so I look for browned, lightly blistered edges, a drier surface, and centers that feel tender when pierced.

This version keeps the fries simple: thin 1/4-inch cuts, a light coating of oil, and cinnamon for warmth. The brown sugar goes on after cooking so it does not burn in the basket, and the marshmallow dip comes together on the stovetop while the fries air fry.

Ingredients for Air Fryer Sweet Potato Fries with Marshmallow Dip

• 1 1/2 pounds sweet potatoes, peeled and cut into 1/4-inch fries (about 675g)
• 1 to 1 1/2 tablespoons neutral high-heat oil, such as avocado, canola, or light olive oil
• 1 teaspoon ground cinnamon
• 1/2 teaspoon kosher salt, plus more to taste
• 1 to 2 tablespoons light brown sugar, for finishing
• 2 cups mini marshmallows (about 100g)
• 1/3 cup heavy cream (about 80g)
• 1 tablespoon unsalted butter (about 15g)

Optional: 1/2 teaspoon vanilla extract for the dip, 2 teaspoons cornstarch for a slightly drier fry surface, and a pinch of flaky sea salt for serving.

Ingredient note: For this recipe, a fresh, fine-ground cinnamon from Selefina works well because it coats the fries evenly instead of clumping in spots.

Use oil rather than butter on the fries. Butter can smoke or scorch in some air fryers, while a neutral oil browns more evenly. If you use the optional cornstarch, dust it onto the dried fries before adding oil and shake off any excess.

How to Make Air Fryer Sweet Potato Fries with Marshmallow Dip

1. Preheat the air fryer: Heat to 380°F (193°C) for 3 to 5 minutes. A hot basket helps the fries start browning instead of steaming.
2. Cut and dry the fries: Peel the sweet potatoes and cut them into even 1/4-inch sticks. Pat them very dry with towels. This is one of the main texture steps, since surface moisture slows browning.
3. Season the fries: Put the fries in a large bowl. If using cornstarch, add it now and shake off any excess. Add the oil, cinnamon, and salt, then toss until the fries have a light, even sheen. Do not add the brown sugar yet.
4. Arrange in a single layer: Place the fries in the basket with a little space between pieces. Do not stack them. For 1 1/2 pounds, cook in about 2 batches so they crisp better.
5. Air fry: Cook at 380°F (193°C) for 12 to 16 minutes, shaking the basket at 6 to 8 minutes. If you are using an oven-style air fryer, rotate the trays halfway through.
6. Check for doneness: Start checking around 10 minutes, especially on the first batch. The fries are ready when the edges are browned and lightly blistered, the centers are tender, and the surface feels drier rather than wet.
7. Cook the remaining batch: Air fry the rest the same way. The second batch may brown a little faster in a fully heated air fryer, so check early.
8. Make the marshmallow dip: While the fries cook, combine the mini marshmallows, heavy cream, and butter in a small saucepan over low heat. Stir continuously until smooth, glossy, and pourable, about 5 to 7 minutes. Stir in the vanilla off heat if using.
9. Finish and serve: Transfer the hot fries to a bowl and toss with the brown sugar. Add a little more salt if needed. The sugar should lightly melt onto the hot fries. Serve right away with the warm dip.

Air Fryer Time and Temperature for Sweet Potato Fries

Cook the fries at 380°F (193°C) for 12 to 16 minutes. Shake once halfway through, and start checking around the 10-minute mark since air fryer models run differently.

I would not chase deep-fried crispness here. Sweet potato fries are usually at their best when the edges are browned and dry, the outside has a little blistering, and the middle stays tender.

How to Keep Air Fryer Sweet Potato Fries from Turning Soggy

The main trouble spots are too much moisture and too much crowding. Cut the fries thin, pat them very dry, use only a light coating of oil, and keep them in a single layer so the hot air can move around them.

I’d also keep the sugar for the end. Sugar added before air frying can burn before the fries are fully tender, especially around the thinner tips.

Troubleshooting

Soggy fries

This usually comes from crowding the basket, cutting the fries too thick, or pulling them too early. Keep cooking until the surface looks dry and the edges are lightly blistered.

Burned edges

This happens when the fries are cut too thin, the air fryer runs hot, or sugar went on before cooking. Start checking early if your model browns aggressively.

Uneven browning

Shake the basket halfway through, and rotate trays if you are using an oven-style model. Even cuts matter more here than they do with thicker potato wedges.

Marshmallow dip too thick or too thin

Keep the heat low. If the dip thickens too much, whisk in a small splash of warm cream. If it is too loose, melt in a few more marshmallows gently.

Easy Variations

Simple marshmallow dip

For a shorter version, use just the mini marshmallows and heavy cream. Melt them gently over low heat and add the cream gradually until the dip is as loose as you want.

Cinnamon marshmallow dip

Stir 1/4 teaspoon ground cinnamon into the finished dip off heat for a warmer, more dessert-like flavor. Keep it light so the dip stays smooth.

Serving

These are best served right away while the fries are hot and the dip is still warm and spoonable. A pinch of flaky sea salt on top helps balance the sweetness.

If you want a less sweet direction, try these Air Fryer Sweet Potato Fries with Chili-BBQ Mayo.

How to Store and Reheat Air Fryer Sweet Potato Fries

Cool the fries completely, then refrigerate the fries and dip separately in airtight containers for up to 3 days. The marshmallow dip will firm up as it chills.

Reheat the fries in the air fryer at 360°F (182°C) for 3 to 5 minutes in a single layer, until hot and the edges crisp up again. They will not be quite as crisp as fresh, but the air fryer works better than the microwave here.

Rewarm the dip gently on the stovetop over low heat or in short microwave bursts, stirring with a splash of cream if needed.

For a faster shortcut, use the no-thaw method in Air Fryer Frozen Sweet Potato Fries.

Nutrition

Approximate nutrition per serving: 1/4 of recipe

• Calories: about 255
• Protein: about 2g
• Fat: about 8g
• Carbohydrates: about 46g

Approximate nutrition per 100g:

• Calories: about 165
• Protein: about 1g
• Fat: about 5g
• Carbohydrates: about 30g

These values are estimates and will vary with the size of the potatoes, the amount of oil used, and how much dip and brown sugar is served with each portion.