Preheat oven to 350 degrees.

Line a baking sheet with parchment paper.

In a medium bowl stir together the flour, baking powder and salt.

In a microwave safe bowl melt one cup of the chocolate pieces. Stir every 30 seconds.

In a large mixing bowl beat butter with an electric mixer for thirty seconds on medium speed.

Add sugar, beat until fluffy.

Scrape sides of bowl.

Add eggs one at a time, mix until combined.

Add vanilla and mint extract.

Beat until combined.

Add melted chocolate and mix well.

Gradually beat in flour mixture and ½ cup chocolate pieces until combined.

Cover with plastic wrap and refrigerate for 30 minutes or until dough is easy to handle.

Scoop dough out and roll into 1-inch balls. Roll balls of dough into powdered sugar.

Place on prepared baking sheet 2 inches apart.

Bake for 10 minutes or until tops are crackled.

Cool on cookie sheet for 2 minutes and then transfer to a cooling rack to cool completely.

Store in an airtight container.