01 - Line a baking sheet with parchment paper and lightly dust it with powdered sugar.
02 - In a medium heavy-bottomed saucepan, mix granulated sugar, corn syrup, and water. Stir over medium heat until sugar dissolves.
03 - Attach candy thermometer to the pan, increase heat to medium-high and bring mixture to a boil without stirring. Continue boiling until reaching 300°F (149°C). Immediately remove from heat.
04 - Allow bubbles to subside, then quickly stir in peppermint extract and optional food coloring as the mixture begins to set.
05 - Using a small spoon, drop approximately half a teaspoon rounds onto the prepared baking sheet, spacing them apart.
06 - Let candies cool and harden completely for about 30 minutes.
07 - Lightly dust set candies with powdered sugar to prevent sticking and store in an airtight container.