Line 2 cookie sheets with waxed paper. In 4-quart heavy saucepan, cook sugar, whipping cream and corn syrup over medium-low heat, stirring frequently, until sugar is dissolved. Heat to boiling over medium heat; cook about 6 minutes, without stirring, to 234°F on candy thermometer or until small amount of mixture dropped into cup of very cold water forms a soft ball that flattens when removed from water. Remove from heat. Add baking chips; stir until smooth.