"Chef John shares two equally melt-in-your-mouth versions of everyone's favorite shortbread thumbprint cookies filled with jam and holiday cheer...."
INGREDIENTS
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1 stick unsalted butter, at room temperature
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1/3 cup unsifted powdered sugar
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1 teaspoon vanilla extract
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1/8 teaspoon almond extract
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1/4 teaspoon fine salt
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1 large egg yolk
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1 1/4 cups all-purpose flour
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1/3 cup white sugar, or as needed
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1/2 cup fruit jam, divided
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Icing:
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1 cup powdered sugar, or as needed
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1 tablespoon milk, or as needed