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Preheat oven to 350°. Prepare a 9 x 5 - inch loaf pan with non-stick cooking spray.
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In a bowl, combine flour, baking powder, baking soda, salt, and cinnamon; stir with a whisk.
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In a bowl of a stand mixer, combine the brown sugar, oil, egg whites, and egg; mix well. Add in banana, oats, and milk; beating well.
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Fold in the dry ingredients until just incorporated and moist.
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Spoon the batter into the loaf pan.
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Bake for 1 hour and 10 minutes or until a wooden pick inserted in center comes out clean. Cool 10 minutes in pan placed on a wire rack; remove from pan. Cool completely on wire rack.