INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, at room temperature
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1 cup granulated sugar
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2 eggs, at room temperature
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1 teaspoon pure vanilla extract
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1 heaping teaspoon grated key lime zest
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1 1/2 tablespoons key lime juice (bottled or freshly squeezed)
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1 1/2 cups all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1/4 teaspoon kosher salt
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1/2 cup buttermilk
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1 1/3 cups loosely packed sweetened coconut flakes (3.5 ounces)
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5 ounces good quality white chocolate, chopped into small chucks
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1/2 cup (1 stick) unsalted butter, room temperature
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3 1/2 cups powdered sugar, sifted
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Pinch salt
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1/2 teaspoon pure vanilla extract
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1 tablespoon key lime juice (bottled or freshly squeezed)
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1/4 cup sour cream
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Finely grated key lime zest, for garnish