In a 3 ½- to 4-qt slow cooker combine milk chocolate, white baking bar, marshmallow crème, cream, and almonds. Cover; cook on low-heat setting for 2 to 2 ½ hours or until chocolate melts, stirring once. Stir until smooth. If desired, stir in amaretto. To serve, spear cake cubes or fruit with fondue forks; dip into chocolate mixture.