1Wash and peel the sweet potatoes. Using a mandoline or a sharp knife, slice the sweet potatoes into very thin rounds, about 1-2 mm thick.
Place the sweet potato slices in a large bowl of cold water and let them soak for at least 30 minutes to remove excess starch. This helps achieve extra crispiness.
Drain the slices and pat them completely dry with a clean kitchen towel or paper towels.
Pour the sunflower oil into a deep, heavy-bottomed pot or deep fryer and heat it to 170°C (340°F).
Working in small batches, carefully add the sweet potato slices to the hot oil. Fry for 2-3 minutes, stirring occasionally, until the chips are golden brown and crispy.
Use a slotted spoon to remove the chips from the oil and transfer them to a plate lined with paper towels to drain excess oil.
While the chips are still hot, sprinkle them evenly with sea salt.
Allow the chips to cool slightly before serving. Enjoy your extra crispy sweet potato chips!