Preheat over to 425. Set a wire rack on extreme of a baking sheet. Spray rack with non-stick spray.
Peel candy potatoes.
Grate candy potatoes after which squeeze the moisture from them. I merely use my fingers to press out the liquid. The extra moisture you take away, the crispier they get contained in the oven.
To the grated candy potatoes, add the egg whites, cheese, pepper, and rosemary. Combine till blended.
Scoop out the potato combination and set on a wire rack. (I used an ice cream scoop)
Press candy potato combination as skinny as doable. Repeat till potatoes are gone.
Bake for 25-Half-hour or till potatoes are darkish all through the sides and crispy.