Preheat the oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper for easier cleanup.
Thoroughly scrub the sweet potatoes under cold running water to remove debris and pat them completely dry with a kitchen towel.
Using the tines of a fork, pierce the skin of each sweet potato 5 to 7 times to allow steam to escape during the cooking process.
Rub each sweet potato with a light coating of olive oil and sprinkle the salt evenly over the skin.
Arrange the potatoes on the baking sheet and roast for 45 to 60 minutes, depending on size, until the internal texture is soft when pierced with a knife.
Remove from the oven and allow to rest for 5 minutes before slicing lengthwise to serve.