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Preheat the oven to 350°F /175°C, and grease a 4x10-inch loaf pan.
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In a mixing bowl, mash the ripe bananas with a fork until completely smooth.
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Stir in the oil. Mix in the baking soda and salt. Stir in the sugar, beaten egg, and vanilla extract. Mix in the flour and walnuts.
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Pour the batter into your prepared loaf pan. Bake for 30-40 minutes, or until a tester inserted into the center comes out clean.
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Remove from oven and let cool in the pan for a few minutes.