Preheat oven to 350 degrees. Grease a jelly roll pan, set aside. (15 1/2 x 10 1/2 x 1")
In your mixer beat sugar, pumpkin, oil, and eggs, for one minute. Fold in baking mix, pumpkin spice seasoning and raisins.
Spread into prepared pan. Bake for 30 minutes or until toothpick inserted in the center comes out clean. Cool. and Frost.
Prepare frosting by creaming together cream cheese, margarine, creamer and vanilla. Slowly add in powdered sugar, until frosting is desired consistency. Frost bars, chill and then slice.
Store bars in the refrigerator.
Notes
I used Pumpkin Spice liquid Coffee creamer in my frosting. I had it on hand, BUT you could use milk in it's place if you don't want to buy it just for the little bit it calls for. :)