"This Classic Jam Thumbprint Cookies recipe is my go-to favorite. The cookies melt in your mouth and you can use your favorite jam!..."
INGREDIENTS
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1/2 cup unsalted butter (softened)
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1/3 cup granulated sugar
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1/2 teaspoon vanilla or almond extract
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1 large egg yolk
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1/4 teaspoon salt
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1 cup all-purpose flour
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1/4 cup jam (any flavor)