On serving plate, place 1 cake layer, rounded side down. Spread raspberry jam over cake layer. Spread 1/2-inch-thick layer of chocolate mixture over jam. Cut 1/2 cup of the raspberries in half; press into chocolate mixture. Top with other cake layer, rounded side up; press lightly. Frost side and top of cake with remaining chocolate mixture. Refrigerate about 1 hour or until firm. Let stand at room temperature about 10 minutes before serving. Garnish with remaining raspberries and candies. Sprinkle with cocoa. Store loosely covered in refrigerator.