INGREDIENTS
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8 tablespoons (1 stick) unsalted butter, room temperature, plus more for pans
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2 1/4 cups all-purpose flour, plus more for pans
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3/4 teaspoon baking soda
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 1/2 cups granulated sugar
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3 large eggs, separated
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2 to 3 ripe bananas, enough to make 1 cup mashed
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1/2 cup buttermilk
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1 teaspoon pure vanilla extract
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1 cup heavy cream
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2 tablespoons confectioners' sugar
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3/4 cup sour cream
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3 bananas, not too ripe
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2 tablespoons unsalted butter
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2 tablespoons dark-brown sugar
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3/4 cup bourbon