Instructions: Beat margarine and sugar until fluffy. Blend in sour cream, eggs, chocolate and vanilla. Add combined dry ingredients alternately with milk, mixing well after each addition. Pour into greased and floured 13 x 9" baking pan. Bake @ 350 degrees, 40 to 45 minutes or until wooden toothpick inserted in center comes out clean. Cool. Frost with Creamy Rum Frosting. Decorate as desired.

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