INGREDIENTS
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10 Tablespoons (1 1/4 sticks) unsalted butter
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1 1/4 cups granulated sugar
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2 eggs
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1/4 cup sour cream
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zest and juice of one lemon
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1 teaspoon vanilla extract
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1 1/2 teaspoons poppy seeds
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2 1/2 cups all-purpose flour
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1 teaspoon baking powder
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1/4 teaspoon kosher salt
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1 cup fresh blueberries
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1 cup confectioners’ sugar