Preheat oven to 350 degrees. Lightly grease cookie sheets.
Combine flour, baking powder and salt in med. bowl.
Combine butter and powdered sugar in lg. bowl; beat until well blended. Add egg and vanilla; beat until blended. Stir in melted chocolate until blended. Gradually stir in flour mixture until well blended.
Shape dough into 36 balls; place 2 in. apart on prepared cookie sheets. Flatten each ball to 1/4 in. thickness; press chocolate candy into center. Bake 6 - 7 min. or until cookies are set. Cool completely on wire rack.