Make candy heart accent. Use heart treat mold to trace pattern onto waxed paper-covered cake board. Melt dark cocoa raspberry Candy Melts candy according to package directions. Use melted candy and cut parchment bag to outline heart pattern and pipe lines across inside of heart. Chill until firm.
Make mousse filling. Prepare mousse following Chocolate Raspberry Mouse Hearts Recipe directions. Fill mousse into chocolate shells; place candy heart accent over mousse.