01 - 
                Beat butter and confectioners' sugar until fluffy, then mix in peppermint extract.
              
              
              
                02 - 
                Whisk flour, cornstarch, and salt, then gradually mix into butter mixture.
              
              
              
                03 - 
                Cover dough and refrigerate for at least 30 minutes.
              
              
              
                04 - 
                Heat oven to 350°F.
              
              
              
                05 - 
                Roll dough into 1-inch balls and place 2 inches apart on baking sheets.
              
              
              
                06 - 
                Bake for 9-11 minutes until bottoms are lightly browned.
              
              
              
                07 - 
                Beat butter, gradually add sugar, milk, peppermint extract, and optional food coloring.
              
              
              
                08 - 
                Frost cooled cookies and sprinkle with crushed peppermint candies.