INGREDIENTS
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For the cookie bars:
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1 cup unsalted butter, softened (2 sticks)
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½ teaspoon salt
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¾ cup powdered sugar
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the seeds scraped from one vanilla bean
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2 egg yolks
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2 1/4 cups all-purpose flour
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For the frosting:
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½ cup unsalted butter, softened (1 stick)
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3 cups powdered sugar
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1/3 cup milk
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the seeds scraped from one vanilla bean
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1 teaspoons pure vanilla extract
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gel food coloring (optional)
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sprinkles (optional)