PREHEAT oven to 375°F. Chop 1 of the chocolate bars; set aside for later use. Break remaining chocolate bars in half; place in microwaveable bowl. Microwave on HIGH 2 min. or until almost melted. Stir until chocolate is completely melted; set aside. Mix flour, baking powder and salt in medium bowl; set aside. Beat butter and sugar in large bowl with electric mixer on medium speed until light and fluffy. Add egg and vanilla; mix well. Blend in melted chocolate. Gradually add flour mixture, beating until well blended. Stir in chopped chocolate, coconut and pecans.
DROP heaping tablespoonfuls of dough, 2 inches apart, onto ungreased baking sheets.
BAKE 10 min. or until cookies are puffed and feel set to the touch. Cool on baking sheets 1 min. Remove to wire racks; cool completely.