Coat a rimmed baking sheet with 5 tablespoons of oil and place in the oven to preheat until just smoking - 5-7 minutes (just like we do for perfect popovers
While oil is heating up, whisk together remaining tablespoon of oil with cornstarch and salt.
Add potatoes to bowl and toss gently to coat.
Carefully arrange the potatoes on the preheated baking sheet and bake until golden brown, 25-35 minutes. Halfway through baking time, flip fries to brown evenly on both sides.
Transfer to paper towels to blot dry and enjoy with your favorite condiments!