Baked Sweet Potato Truffle Fries Recipe

These oven-baked sweet potato truffle fries are cooked in truffle oil for that distinctive earthy flavour. Top with a generous sprinkle of our 2 minute vegan parmesan cheese for a salty, nutty hit, and fresh parsley for a pop of colour.

This straightforward recipe for sweet potato truffle fries will elevate your dinner with the unique flavour of truffle. Oven-baked, not fried, for a lighter finish, these skinny truffle sweet potato fries achieve delicious, crispy edges in a hot oven.

If this is your first time trying truffle fries, you’re in for a treat!  Serve them as a side dish with a fully loaded vegan burger and top with our savoury, moreish 2-minute vegan parmesan, made from a handful of cupboard ingredients.

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• The written recipe
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• Why you’ll love this recipe
• Success tips
• Step by step
• FAQs
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Why you’ll love these Sweet Potato Truffle Fries

They’re easy to make. Preparation is kept simple in this recipe; slice your potatoes into skinny fries, coat them in truffle oil, sprinkle them in salt, lay them out on a lined tray and bake. You’ll need a large baking tray, a large mixing bowl and a sharp knife so that you can cut your fries nice and thin so that the edges go crispy in the oven.

Healthier than regular fries. Sweet potatoes are high in fibre and are a good source of vitamin C, vitamin B and potassium (source). These truffle sweet potato fries are baked, rather than being deep-fried, using less oil and making them a healthier alternative to some of the more traditional home-cooked fries.

Moreish, earthy, savoury flavour. There’s something about the flavour combination of truffle and parmesan that goes together SO WELL. Earthy, nutty, salty deliciousness in the form of vegan parmesan truffle fries.

A little bit fancy. Elevate dinner with something a bit different. Sweet potato truffle fries have got to be the most delicious sweet potato fries.  We use truffle oil to add that beautiful, unique flavour, so you’ll have a bottle on hand for the next time you fancy another batch of these sweet potato truffle fries.

Success Tips

1. Cut the fries thin. Use a sharp knife to cut your fries into 0.5cm-0.75cm thin fries (1/4”-1/3”). For best results, try to make them as uniform as possible to ensure even cooking. Don’t go any thinner than this and trim off any particularly thin ends, as these can burn quite quickly in the oven.
2. Line the tray with parchment paper. Lining the baking sheet with parchment paper helps you to achieve crisp fries, without them burning. Placing the fries directly onto an unlined baking tray can cause your fries to burn.
3. Space out the fries. For crispy fries, it’s important to place the fries in a single layer on the baking tray, with space in between each one. If you overcrowd the tray the fries won’t crisp up on the edges. You can make a double batch of these flavorful fries, but you’ll want to use 2-3 trays to ensure the fries are not overlapping on the tray.
4. Use good quality truffle oil.  For the best flavour, pick a good quality truffle oil.
5. Enjoy these truffle sweet potato fries fresh. Whilst you can reheat fries, they don’t reheat very well and are so much better when enjoyed fresh. If you do want to reheat them, place them in a preheated oven (180°C fan / 200°C conventional / 400°F / gas mark 6) for 5-7 minutes on a lined baking tray, or in the air fryer in a single, even layer for 2-3 minutes at 180°C).

A note on soaking. Recipes often call for the potatoes to be soaked in cold water when making homemade fries. We did not find a noticeable difference in the end result during testing for soaked fries vs un-soaked fries so you can skip the soaking.

A note on cornflour. You sometimes see recipes that call for homemade fries to be sprinkled in cornstarch before baking to increase their crispness. We found that this added a powdery coating to the fries that we weren’t keen on, hence opting to make these truffle oil sweet potato fries without cornflour.

How to make these Sweet Potato Truffle Fries

Ingredients

Sweet potato. We use 600g of regular orange sweet potatoes for this recipe (approximately 2 medium sweet potatoes).  A simple ingredient that turns into such a delicious snack or side dish!

Truffle-infused oil.  Use a high-quality truffle oil for the best flavor (and avoid artificial truffle flavors).

Salt.  For added truffle flavour, use truffle salt (or regular sea salt is also fine!).

Equipment

You’ll need a large baking tray, big enough to spread out your fries so that they are not overlapping.

Steps

Make sure to head to the recipe card below for the full recipe and instructions for making these sweet potato fries with truffle oil!

Wash, peel and then cut your sweet potatoes into even skinny fries, of around 0.5cm – 0.75cm thick (1/4” – 1/3”).

Note: Don’t go any skinnier than 0.5cm (1/4”) otherwise the fries will be more likely to burn. We don’t recommend going above 0.75cm / 1/3” thick otherwise you’ll find it hard to achieve a crisp finish.

Add the potato strips to a large bowl with the truffle oil and a generous sprinkling of sea salt. Shake the bowl gently to evenly coat the fries.

Spread the fries out onto a large baking tray lined with parchment paper.

Note: It’s important to spread out the fries and give them plenty of space to ensure they crisp up on the edges. Don’t allow them to overlap – use two trays if necessary.

Bake for 15 minutes. Use a spatula to flip the fries over.

Bake for a further 5 minutes before checking the fries. If the fries are crisp on the edges, they’re ready to come out. If they are not yet crisp, give them another 3-5 minutes before checking again. Keep an eye on them to ensure they don’t burn.

Note: Cooking time will be around 22-25 minutes in total but can vary depending on how crisp you like your fries, how your oven cooks and how thick you have cut the fries, hence the approximate timings.

Sprinkle the hot fries with the vegan parmesan and a little chopped fresh parsley. Serve straight away.

FAQs

What causes soggy fries?

Soggy fries can be caused by a number of things, including cutting them too thick or placing them too close together on the tray. Our top tips are to cut them to around 0.5cm thick (1/4”) and spread them out on the baking tray so there is space between each of the fries.

Do I need to soak my fries?

In our tests, soaking the fries before baking did not seem to alter the level of crispiness after baking, so we don’t recommend wasting time on soaking your sweet potato fries before baking.

Loved these Sweet Potato Truffle Fries? Here are some more delicious vegan sides to try:

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