"Mascarpone is an Italian cheese that's superrich, delicate and creamy. Here, it's simply blended with confectioners' sugar to create a sublime, snow-white frosting. For the best results, try to buy mascarpone that's very fresh. Beautiful Desserts ..."
INGREDIENTS
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1 1/2 cups all-purpose flour
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3/4 teaspoon baking powder
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3/4 teaspoon baking soda
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Scant 1/2 teaspoon salt
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1 stick (4 ounces) unsalted butter, softened
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3/4 cup granulated sugar
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2 large egg yolks
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1 teaspoon pure vanilla extract
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3/4 cup mashed ripe banana (1 1/2 large), plus 2 large bananas, thinly sliced
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1/4 cup plus 2 tablespoons buttermilk
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3 large egg whites
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1 1/2 cups chilled mascarpone (12 ounces)
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1 3/4 cups confectioners' sugar