INGREDIENTS
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1 c. butter, at room temperature
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2 c. granulated sugar
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2 large eggs
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4 egg yolks
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1 T. vanilla extract
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4 c. all-purpose flour
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1 tsp. baking powder
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2 T. cornstarch
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1/2 tsp. Kosher salt
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1 c. butter, at room temperature
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1 T. vanilla bean paste (or vanilla extract)
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4 cups powdered sugar
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pinch of kosher salt
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2-3 tablespoons milk (enough to make a spreadable consistency)