In a bowl, combine flour, baking powder and salt; set aside. Combine and microwave ½ cup chocolate chips and ½ cup crushed Andes mints for 1 minute; stir. Microwave in 15 seconds increments (stirring in between) until smooth.
In bowl, beat butter and sugar until creamy. Add melted mixed chocolate and vanilla. Beat in eggs. Gradually beat in flour mixture. Stir in remaining chocolate and mint morsels.
Wrap dough in plastic wrap; freeze until firm (30 minutes to an hour).
Preheat oven to 350°.
Shape dough into 1-inch balls; coat with confectioners sugar. Place on ungreased cookie sheet.
Bake 10-12 minutes, until tops appear cracked. Let stand on cookie sheet. Cool completely.