Preheat oven to 350. Line cookie sheets with parchment paper
Whisk together in a bowl, flour, baking soda, cocoa powder, and salt until well blended.
In a large bowl beat butter with both sugars until light and fluffy. Add eggs and vanilla and beat in
Stir in flour mixture just until well combined
Add peppermint candy and fold it into the batter
Roll dough into 1 inch balls and place on prepared pans. Press a Andes Ch I colate mint half into the center of each ball
Bake for 9 to 11 minutes, remove them while they still are slightly soft in the middle. Cool on cookie sheets 5 minutes then transfer to racks to cool completely