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Preheat oven to 350 degrees.
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Grease or spray a 9x13 pan.
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Beat sugar, mashed bananas, oil, vanilla and eggs in a large bowl.
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Add 1/2 cup of flour along with the baking powder, baking soda, cinnamon, and salt. Mix well.
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Add the other 1/2 cup of flour and mix until well blended.
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Add the walnuts and mix.
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Pour batter into greased pan and spread evenly.
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Bake for 25-30 minutes until toothpick inserted in center comes out clean or with just a few crumbs.
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Cool completely.