1. In a mixing bowl, beat the butter, sugar, eggs and vanilla.
  2. When it is well mixed, add the mashed bananas.
  3. In a separate bowl combine the flour, baking powder and baking soda.
  4. Gradually add the flour mixture to the wet mixture, beating a little after each addition.
  5. Pour into a lightly greased and floured 9" x 13" cake pan and bake at 350°F for about 25 minutes or until a knife inserted near the center comes out clean.

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