01 - Line a baking sheet with parchment paper and dust lightly with powdered sugar.
02 - In a medium saucepan, combine granulated sugar, water, and corn syrup. Stir over medium heat until sugar dissolves.
03 - Increase heat and bring mixture to a boil. Cook without stirring until syrup reaches 300°F (150°C) on a candy thermometer.
04 - Remove from heat immediately. Stir in peppermint extract and optional red food coloring, mixing quickly and carefully as mixture will be extremely hot.
05 - Use a teaspoon or small cookie scoop to drop small mounds of hot syrup onto prepared baking sheet, spacing them apart.
06 - Allow candies to cool and harden completely, approximately 30 minutes to 1 hour.
07 - Toss cooled candies lightly in powdered sugar to prevent sticking. Store in an airtight container.