INGREDIENTS
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1/2 cup (1 stick) unsalted butter, softened
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1/2 cup granulated sugar
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1 vanilla bean, scraped or 1 teaspoon pure vanilla extract
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1 large egg yolk
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1 cup plus 2 tablespoons all-purpose flour, plus more for pressing dough into pan
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1/4 teaspoon salt
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1/4 cup plus 1 tablespoon fruit preserves
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15 marshmallows, cut in half