INGREDIENTS
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2 1/2 cups (354g) all-purpose flour
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1 tsp baking powder
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1/2 tsp salt
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10 Tbsp (5 oz) unsalted butter, softened slightly*
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1 cup (215g) granulated sugar
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Seeds of 1 small vanilla bean
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1 large egg
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1 large egg white
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3 Tbsp sour cream
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1/2 tsp vanilla extract
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1/2 cup (4 oz) butter (I like to use 1/4 cup salted and 1/4 cup unsalted)
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Seeds of 1 small vanilla bean
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1/2 tsp vanilla extract
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2 cups (240g) powdered sugar
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2 Tbsp half and half