INGREDIENTS
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2/3 cup sugar
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1/2 cup sour cream
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1 egg
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2 tablespoons unsalted butter, softened
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3/4 cup mashed super ripe banana (about 2)
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1 teaspoon pure vanilla extract
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1 cup all purpose flour
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1/4 teaspoon salt
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1/2 teaspoon baking soda
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Frosting:
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2 tablespoons unsalted butter, softened
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1 1/4 cups confectioner's sugar, sifted
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1/4 cup heavy cream
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1/2 teaspoon vanilla bean paste* (see below)