In a large mixing bowl, combine powdered sugar, corn syrup, softened butter, peppermint extract, and food coloring (if using). Mix until a smooth dough forms.

Knead the dough gently with your hands until it becomes pliable and no longer sticky. If too sticky, add a little more powdered sugar.

Roll the dough into small balls, about 1 inch in diameter, and place them on a parchment-lined baking sheet.

Flatten each ball slightly with the bottom of a glass or your fingers to form candy discs.

Roll each candy in granulated sugar to coat evenly.

Let the candies dry at room temperature for about 1 hour, or until firm.

Store in an airtight container at room temperature for up to 2 weeks.