Preheat oven to 400°.
Combine oil and potatoes on a jelly roll pan coated with cooking spray, tossing to coat. Sprinkle with salt and peppers; toss to coat. Bake at 400° for 20 minutes or until tender when pierced with a knife.
Small fingerlings become deliciously fluffy inside when they're roasted. Red-fleshed fingerling potatoes are waxier than yellow-fleshed, so they crisp on the outside; use whatever variety you can find, though, since either will work.
We like the crunchy texture of kosher salt, but you can also use 1/2 teaspoon regular table salt.