INGREDIENTS
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Butter, for coating the pan
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2 cups all-purpose flour, plus extra for dusting the pan
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2 teaspoons baking powder
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1/2 teaspoon plus 1/8 teaspoon fine salt
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1/2 teaspoon baking soda
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1/2 teaspoon ground cinnamon
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1 cup granulated sugar
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2 large eggs, at room temperature
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1/3 cup vegetable oil
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1 teaspoon vanilla extract
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4 very ripe medium bananas, mashed (about 1 1/4 cups)
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1/2 cup sour cream