1Heat oven to 375°F. In large bowl, stir cookie mix, butter, egg and flour until dough forms. Roll dough into 1 1/4-inch balls. Place 2 inches apart on ungreased cookie sheet. Flatten slightly with bottom of glass.
2Bake 8 to 10 minutes or until edges are light golden brown. Cool 1 minute; remove from cookie sheet to wire rack. Cool completely, about 20 minutes.
3In small bowl, mix frosting and peppermint extract. Spread each cookie with frosting. Using small spoon, sprinkle red sugar onto cookies in spiral design to look like peppermint candies.