INGREDIENTS
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1 1/3 cups all purpose flour
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1/2 teaspoon baking powder
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1/8 teaspoon baking soda
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1/4 teaspoon salt
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4 tablespoons unsalted butter, softened
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1/2 cup sugar
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1 vanilla bean, split in half down the middle longways and seeds scraped into a bowl (discard the pod)
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1 egg
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1 teaspoon vanilla extract
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1/2 cup milk
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1 cup powdered sugar
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Pinch of salt
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3-4 teaspoons milk
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1/4 teaspoon vanilla extract