Peel sweet potatoes and thinly slice them using a knife or mandoline into 1/8-1/4 inch rounds. Add them to a medium bowl, drizzle with oil, sprinkle with cornstarch, garlic powder, paprika, cumin, chili, powder, and salt, and toss to coat.
3 medium sweet potatoes, 1 Tablespoon cornstarch, 1/2 teaspoon garlic powder, 1/2 teaspoon paprika, 1 teaspoon cumin, 1/2 teaspoon chili powder, 1 teaspoon kosher salt, 1 Tablespoon olive oil