Preheat oven to 450° F. Spray a cookie sheet with cooking spray.

Cut potato into strips to resemble fingers.

Whisk egg slightly, then set aside.

Place bread crumbs, pepper, and Parmesan in a shallow bowl and mix together.

Dip each "finger" into the egg whites and then into the bread mixture, then place onto the baking sheet.

Bake for 18-20 minutes until crispy, turning halfway through baking.