Spray cookie sheet with cooking spray; line cookie sheet with cooking parchment paper. Spray parchment paper with cooking spray. In 2-quart saucepan, cook sugar and water over medium heat, without stirring, to 325°F on candy thermometer or until small amount of mixture dropped into cup of very cold water separates into hard, brittle threads, swirling pan occasionally. (Watch carefully so mixture does not burn.) Immediately remove from heat. Pour mixture onto lined cookie sheet, spreading in thin layer. Cool completely. Break into shards.