Preheat oven to 400 degrees.
In mixer with bowl, beat butter and sugar
Add egg, peppermint extract, vanilla extract, melted and cooled chocolate, cocoa mix well.
Add in flour, baking powder, salt and blend until all combined.
Roll out cookies in between wax paper or lightly floured work surface to ¼ inch thick and cut with cookie cutter.
Place cookies onto parchment lined baking sheets and bake for 7-9 minutes or until edges are firm.
Remove cookies from baking sheets when they are cooled.