Preheat the oven to 450°F and position the rack on the lowest level. Peel and slice potatoes, then microwave until soft. Pat them dry, toss with a mixture of vegetable oil, salt, and cornstarch.
Heat a baking pan with oil, place potatoes on it, and bake for 25-30 minutes, flipping halfway. Drain on a paper towel and garnish with salt, minced chives, and parmesan cheese before serving hot.