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Preheat the oven to 350F.
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Mix the butter into the mashed bananas in a large mixing bowl.
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Mix in the sugar, egg, spices, and vanilla.
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Sprinkle the baking soda and salt over the mixture and stir in.
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Add the white flour, wheat flour and oats and mix in.
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Pour the dough into a greased 4×8 inch loaf pan. Sprinkle the top with a little oats.
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Bake for about 1 hour or until a toothpick comes out clean from the center.