"A simple recipe for classic thumbprint cookies..."
INGREDIENTS
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1 cup unsalted butter (softened to room temperature (226g))
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1/3 cup sugar ((70g))
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1/3 cup light brown sugar, tightly packed ((70g))
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1 large egg yolk
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3/4 teaspoon vanilla extract
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2 1/4 cup all purpose flour ((280g))
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2 teaspooons cornstarch
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1/2 teaspoon salt
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1/2 cup sugar (for rolling (optional))
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1/3 cup jam or preserves (flavor of your choice -- I used raspberry preserves for this recipe (105g))