HEAT oven to 350 F.
GREASE 15"x10"x1" jelly roll pan.
COMBINE all bar ingredients, except nuts and raisins, in a large bowl.
BEAT at low speed until moistened.
BEAT 2 minutes at medium speed.
STIR in nuts and raisins.
POUR into greased pan.
BAKE for 25 to 30 minutes or until toothpick inserted in center comes out clean.
SPREAD cream cheese frosting over bars and store in refrigerator.
COMBINE all frosting ingredients in a small bowl and beat until smooth.
SPREAD frosting on cooled bars and refrigerate.