Pumpkin Spice Frosted Snack Cake

1 package (2 layer size) spice cake mix
1 can (15 oz) pumpkin
1 cup Miracle whip dressing
3 eggs
1 pkg (8 oz) philadelphia cream cheese, softened
1/4 cup (1/2 stick) butter, softened
2 tbsp milk
1 tsp vanilla
1 pkg (16 oz) powdered sugar (about 4 cups)
preheat oven to 350. Grease 13X9 inch baking pan; set aside. Beat cake mix, pumpkin, dressing, and eggs in large bowl with electric mixer on medium speed until blended. Pour into prepared pan
bake 32-35 min or until wooden toothpick inserted in center comes out clean. cool completely in pan on wire rack.
beat cream cheese, butter, milk and vanilla in large bowl with electric mixer on medium speed until well blended. gradually add sugar, beating after each addition until well blended. spread over cooled cake. cut into pieces to serve. store any leftovers in refrigerator.