Preheat oven to 325 degrees. Whisk sugar and flour in a bowl. Add whites, then butter; whisk until smooth.
Line a baking sheet with a nonstick baking mat. Coat mat with cooking spray. Spread 1 teaspoon of batter onto prepared sheet in a 3 1/2-inch-wide circle. Repeat, spacing circles 2 inches apart. Bake until tuiles begin to turn golden brown, about 12 minutes. Remove from oven, and place sheet on a wire rack. Working quickly, roll 1 cookie at a time: Flip it over, roll it tightly around a chopstick, then slide it off and place on a cool, flat surface. Repeat. If the cookies become brittle, return them to the oven for about 30 seconds.
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