Preheat oven to fan assisted 200C / 220C / 425F / gas 7.

Cut the ends of the sweet potatoes, peel them and cut into fries - try and cut them into even sizes so that they cook at the same rate.

Put potatoes into a ziplock bag (or a bowl ) add the corn flour, paprika and salt if using and shake to coat the potatoes.

If excess flour remains at the bottom of the bag then shake it out.

Add the oil to the potatoes and mix again till the potatoes are fully coated.

Transfer the fries to a non stick baking tray - spreading them out in a single layer with space between them.

Bake for about 15 mins then turn the fries over so that they cook on the other side.

Bake for another 15 mins till they are crispy (the edges might be a little bit brown but that just adds to the sweet taste).

Take them out of the oven and let them cool for about 5 mins.

Mix the garlic mayonnaise and chilli sauce together till very are very well combined.

Serve the fries with portions of the garlicky dipping sauce - omit the mayonnaise if serving vegans.

The best baked sweet potato fries ever.