Apple Raisin Snack Cake

2/3 cup salad dressing
1 (18.25 ounce) box spice cake mix
2 eggs
1/2 cup chopped apple
1/2 cup raisins
1/2 cup butter or margarine
1/2 teaspoon rum extract
3 1/2 cups confectioners'' sugar

Heat oven to 350 degrees F.

Blend salad dressing, cake mix and eggs at low speed with electric mixer until moistened. Beat on medium speed 2 minutes. Add apples and raisins. Spread into a greased 13 x 9-inch baking pan. Bake 25 to 30 minutes or until wooden pick inserted in center comes out clean. Cool.

Blend butter or margarine and rum extract. Gradually add sugar, beating at high speed with electric mixer until light and fluffy. Spread over cake.