"Traditional buttery thumbprint cookies filled with sweet fruity jam. Includes many other fun ways to make them!..."
INGREDIENTS
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2/3 cup (135g) granulated sugar
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1/4 tsp salt
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1 cup (226g) unsalted butter, (at room temperature)
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2 large egg yolks*
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1 tsp vanilla extract
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2 cups (283g) all-purpose flour ((scoop and level to measure))
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1/2 cup fruit preserves (or jam, such as Bonne Maman)