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