1Heat oven to 350°F. Grease bottom and sides of 15x10x1-inch pan with shortening or cooking spray.
2In large bowl, beat all bar ingredients except raisins with electric mixer on low speed 30 seconds, scraping bowl frequently. Beat on medium speed 2 minutes, scraping bowl occasionally. Stir in raisins. Pour into pan.
3Bake 25 to 30 minutes or until toothpick inserted in center comes out clean. Cool completely, about 2 hours.
4In medium bowl, beat cream cheese, butter, milk and vanilla with electric mixer on low speed until smooth. Gradually beat in powdered sugar on low speed until smooth. Spread over bars. For bars, cut into 8 rows by 6 rows. Store covered in refrigerator.