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Mix butter, sugar, eggs, vanilla extract and salt.
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Slowly add flour and ground hazelnuts. Knead well by hand.
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Wrap dough in aluminum foil, and refrigerate for about 2 hours.
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Preheat oven to 400 F (200 C).
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Roll dough into long, snake-like shape. About 1 inch in diameter.
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Cut into even pieces (about 1/4 inch thick). Form small balls.
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Indent top with pinky or similar sized tool, until you have enough room for the jam. Keep in mind that baking reduces the size of the hole.
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Place on baking sheet, and bake for 12-15 minutes, until golden brown.
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Remove when done, and let cool.
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Melt jelly in microwave until fluid.
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Shake powdered sugar over cookies, and fill holes with jelly.