01 -
Beat the softened butter, powdered sugar, and peppermint extract on medium speed for 2-3 minutes, until smooth and slightly pale.
02 -
Whisk the flour, cornstarch, and salt in a separate bowl. Add to the butter mixture on low speed and mix just until a soft dough forms.
03 -
Cover the bowl and refrigerate for 30 minutes, or until the dough is firm enough to roll without sticking.
04 -
Heat the oven to 350 degrees F. Line baking sheets with parchment. Roll level tablespoon portions of dough into 1-inch balls and place them 2 inches apart.
05 -
Bake for 9-11 minutes, until the tops look set and the bottoms are lightly golden. Cool on the baking sheet for 10 minutes, then move to a wire rack to cool completely.
06 -
Beat the softened butter, powdered sugar, 1 tablespoon milk, peppermint extract, and optional food coloring until smooth. Add more milk a teaspoon at a time if needed.
07 -
Spread frosting over the cooled cookies. Sprinkle with crushed candy canes right away so the pieces stick before the frosting sets.