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Dough: in a food processor with a steel blade, put flour, almond meal, cornstarch, butter, powdered sugar, vanilla and salt and blend until a crumbly mixture is obtained.
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Add the yolk and continue to blend until large chunks of dough form. If the dough does not combine into large lumps - gradually add a little water.
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Transfer the dough to a lightly floured work surface, and form a disc shape with your hands.
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Wrap in plastic wrap and cool in the refrigerator for about an hour.
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On a floured surface, roll out the dough about 3-4 mm thick and cut out cookies of the desired shape. Make a small hole in ½ of the cookies using a small round cookie cutter.
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Place the cookies on a baking pan lined with baking paper.
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Preheat the oven to 170c degrees.
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Bake the cookies for 15-20 minutes or until golden brown.
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Cool completely at room temperature.
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Fill each pair of cookies with jam and close to a small sandwich.
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Decorate with powdered sugar and serve.