INGREDIENTS
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1 1/3 cups (286g) granulated sugar
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1 cup (218g) sour cream
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2 large eggs
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1/4 cup (2oz) unsalted butter, softened
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1 1/2 cups (368g) mashed overripe bananas (from about 3 large)
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2 tsp vanilla extract
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2 cups (290g) all-purpose flour
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1 tsp baking soda
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1/2 tsp salt
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1/4 cup unsalted butter, softened
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1/4 cup + 3 Tbsp heavy cream
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Seeds of 1 vanilla bean
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2 1/2 cups powdered sugar