PREHEAT oven to 325°F. Lightly grease and flour large baking sheet. Mix flour and baking powder in medium bowl; set aside.
BEAT butter and sugar in large bowl with electric mixer on medium speed until light and fluffy. Add eggs and vanilla; mix well. Gradually add flour mixture, beating until well blended after each addition. Stir in 1-1/2 cups of the chopped chocolate, and cherries and pecans.
ROLL dough to 1/4-inch thick on floured surface. Cut with 3-inches heart-shaped cookie cutter, re-rolling dough scraps as needed. Place hearts, 2-inches apart, on prepared baking sheet.
BAKE for 10 to 12 minutes or until lightly browned; turn hearts over on baking sheet. Bake an additional 10 to 12 minutes or until slightly dry and golden brown. Remove to wire racks; cool completely.
MELT remaining chopped chocolate as directed on package. Drizzle over hearts. Let stand until chocolate is firm.