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In a medium bowl, mash the bananas.
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Add the egg, buttermilk, brown sugar and vanilla.
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Whisk all together until egg yoke has broken and mixture is well mixed.
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In a large bowl, measure the flour, baking powder, baking soda and salt.
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Whisk all together until thoroughly mixed.
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Stir in the liquid ingredients just until all dry ingredients are moistened. There will be lumps.
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Pour batter into a greased loaf pan (9" x 5").
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Bake at 350 degrees for 45 minutes.
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Test for doneness with toothpick inserted into middle of loaf - it should come out clean.
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Cool loaf in pan for 5 minutes, then carefully turn out onto a rack to cool thoroughly.
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Can be stored at room temperature if you're going to eat it up within a couple of days.
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Otherwise store in the fridge.