Lightly coat bread with cooking spray. Place bread on a baking sheet; broil 3 minutes on each side or until toasted. Remove bread from oven.
Reduce oven temperature to 350°.
Sprinkle each bread slice with about 1 1/2 tablespoons chocolate. Bake 5 minutes or until chocolate melts. Sprinkle evenly with salt; garnish with orange rind, if desired. Serve warm.