Olive oil cooking spray, for spraying baking sheet
1 pound russet potatoes
1 large egg white
1/4 cup finely chopped scallions (about 2 scallions)
Kosher salt and freshly ground black pepper
1/2 cup no-sugar-added applesauce
1/4 cup reduced-fat sour cream
Preheat the oven to 450 degrees F. Mist a baking sheet with the cooking spray.
Peel the potatoes and then grate on the large holes of a box grater. Transfer
to a fine-mesh sieve and squeeze out as much liquid as possible into a
bowl. Let the liquid settle for about 10 minutes, and then pour off the
watery liquid, reserving the potato starch.
Beat the egg white in a large bowl until it holds a soft peak. Gently fold
in the potatoes, scallions, reserved potato starch, 1/2 teaspoon salt
and 1/4 teaspoon pepper.
Drop the mixture by tablespoons on the prepared baking sheet, spacing the
latkes about 2 inches apart. Gently spread and flatten into 2 1/2-inch
rounds. Roast until the bottoms are browned, 8 to 10 minutes. Flip and
roast until the potatoes are cooked through and the bottoms are spotted
brown, 4 to 6 minutes.
Serve with the applesauce and sour cream.