Make the basic cookie dough if you don't have it already.
In a large bowl, beat the butter until light and fluffy.
Add the sugar and salt and beat until well combined.
Beat in the egg and vanilla until well combined.
Gradually add the flour in batches and beat slowly until well combined.
Chill until ready to bake.In a large bowl, beat the butter until fluffy.
Make the peppermint cookie dough.
Preheat oven to 350 degrees F. Line a baking sheet with parchment paper or a silicone baking mat. Crush peppermint candies in a resealable bag using a rolling pin.
Add food coloring and peppermint extract to basic cookie dough and mix well. Roll into 1 inch balls and place on prepared baking sheet. Using a flat bottomed glass, lightly press down each cookie ball.
Bake for 8-10 minutes or until edges are set and slightly golden brown. Remove pan and let cookies set for 1-2 minutes. Remove them and cool completely on a wire rack.
Dip the peppermint cookies.
Melt chocolate in microwave safe bowl.
Dip edge of cookie into chocolate and immediately sprinkle with crushed peppermint.
Set cookie on a wire rack until the chocolate is set.
Store in airtight container until ready to serve.