Instructions

  1. Set oven to 350 degrees.
  2. Butter a 13 x 9-inch baking pan (set oven rack to second-lowest position).
  3. In a bowl sift both flours, baking soda and salt together; set aside.
  4. In another small bowl mix the buttermilk with the mashed banana; set aside.
  5. Cream the butter, oil, both sugars and vanilla together until fluffy (about 3-4 minutes).
  6. Add in the eggs, one at a time to the creamed mixture, beating well after each addition.
  7. Add in the banana/buttermilk mixture; beat until combined.
  8. Add in the poppy seeds.
  9. Add in the flour mixture to the creamed mixture with a wooden spoon ONLY until combined (do not over mix!).
  10. Transfer batter to prepared baking pan.
  11. Bake for about 30-35 minutes, or until cake test done.
  12. Frost with favorite cream cheese frosting or dust with powdered sugar.