Heat oven to 350*. Grease jelly roll pan, 15x10x1.
Beat all ingredients except raisins and frosting in large bowl with electric mixer on low for 30 seconds, scraping bowl frequently. beat on medium 2 minutes, scraping bowl occasionally. Stir in raisins. pour into pan.
Bake 25 to 30 minutes or until toothpick inserted comes out clean. Cool completely, about 2 hours. Frost with cream cheese frosting.
Beat cream cheese, butter, milk and vanilla in medium bowl with electric mixer on low until smooth. Gradually beat in powdered sugar on low until smooth.
For bars cut into 8 rows by 6 rows. Store in refrigerator.