Chop the sweet potato into long sticks of about the same size, about 0,20 inches (0,5 cm) thick.
Put the sticks in a big bowl, cover with cold water and let them sit for 30 minutes at least or overnight.
Preheat the oven to 419ºF (215º C). Line a big baking sheet of about 16 x 11 inches (40 x 28 cm).
Take the sweet potato sticks out of the water and place them on top of a clean kitchen towel to absorb moisture. Place them in the bowl again, without water, add the oil and mix so they are all well coated.
Add the corn starch along with the rest of the spices but the salt, and mix again to the aticks are all coated.
Place the sweet potato sticks on the baking sheet, somewhat separated from each other and without stacking them so they cook thoroughly.
Bake for at least 15 minutes, once this time has passed, take the baking sheet out and turn the swwt potato sticks quickly using a fork so they can cook on the other side. Put the baking sheet back in the oven and bake for another 10 to 15 minutes or until the sticks are crunchy.
Once ready, take the sweet potatos out and season them with salt to taste. Wait for at least 5 minutes so they get crunchier and enjoy before they turn soft and bland.