This is a very moist & very fudgey cake. It tastes best the second day.
Preheat oven to 350 degrees F.
Cream margarine with sugar and eggs.
Mix in banana and vanilla.
Mix flour with remaining dry ingredients.
Add flour mixture to margarine mixture in 3 parts, alternately with sour milk.
Begin and end with flour.
Spread in 2 greased 8" cake pans.
Bake in oven about 40 minutes.
When cool, frost generously with chocolate butter frosting.
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